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  # In a sequence of numbers in which each term after the first
  
  Author Message
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  Joined: 19 Oct 2009
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  In a sequence of numbers in which each term after the first [#permalink]  14 Nov 2009, 06:38
  00:00
  
  Difficulty:
  
  (N/A)
  
  Question Stats:
  
  100% (01:50) correct 0% (00:00) wrong based on 3 sessions
  In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term?
  
  (1) The first term is 1.
  (2) The sixth term minus the fifth term is 32.
  
  Yeah friends, I just solved it completely to know whether the info is sufficient. It took me nearly 3 minutes. I am horrified. Can this be solved within 2 mins through any formula or expression ? Please-please-please tell me. I am dying to know.
  Joined: 20 Aug 2009
  Posts: 312
  Location: Tbilisi, Georgia
  Schools: Stanford (in), Tuck (WL), Wharton (ding), Cornell (in)
  Followers: 14
  
  Kudos [?]: 103 [0], given: 69
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 06:48
  let the first term be x, then sequence looks like
  
  1 - x
  2 - 2x+1
  3 - 4x+3
  4 - 8x+7
  5 - 16x+15
  6 - 32x+ 31
  
  (1) if x=1, then 5th term = 31, SUFFICIENT
  
  (2) if (32x+31)-(16x+15) = 16x+16 = 32; x=1; 5th term = 31; SUFFICIENT
  
  hence D
  
  It shouldn't took more than 2 minutes IMO
  Manager
  Joined: 13 Oct 2009
  Posts: 115
  Location: USA
  Schools: IU KSB
  Followers: 4
  
  Kudos [?]: 60 [0], given: 66
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 06:56
  gmat620 wrote:
  In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term?
  
  (1) The first term is 1.
  (2) The sixth term minus the fifth term is 32.
  
  Yeah friends, I just solved it completely to know whether the info is sufficient. It took me nearly 3 minutes. I am horrified. Can this be solved within 2 mins through any formula or expression ? Please-please-please tell me. I am dying to know.
  
  Question stem says - nth term =2* (n-1)th term +1
  fifth term =?
  
  1) first term = 1
  second term = 2*first term+1
  and so on.... you can find fifth term using the above formula but you don't really have to calculate.
  
  SUFFICIENT
  
  2) sixth term - fifth term = 32
  
  sixth term = 2* (fifth term) +1
  
  you can find fifth term here. SUFFICIENT
  
  Joined: 20 Aug 2009
  Posts: 312
  Location: Tbilisi, Georgia
  Schools: Stanford (in), Tuck (WL), Wharton (ding), Cornell (in)
  Followers: 14
  
  Kudos [?]: 103 [0], given: 69
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 07:26
  yeah, it's important to remember that in DS questions you get no additional points for calculating something. You should only show wether it's possible to calculate (given this amount of info) or not.
  Manager
  Joined: 20 May 2009
  Posts: 61
  Followers: 1
  
  Kudos [?]: 12 [0], given: 3
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 16:49
  IMO D...
  Statement 1 : Sufficient, because 1st term is given you can find the fifth term(no need to actually calculate it).
  Statement 2 : Sufficient, let fifth term be X, therefore sixth term=2X+1=>2X+1-X=32=>x=31
  
  Would take less than a minute..
  Re: O man I don't know the shortcut for this one   [#permalink] 14 Nov 2009, 16:49
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  10 In the sequence S of numbers, each term after the first two 5 26 Feb 2014, 01:21
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  2 After the first term, each term in a sequence is five times 3 27 Oct 2010, 17:44
  In a sequence of numbers in which each term after the first 2 31 May 2007, 05:42
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  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: Find all School-related info fast with the new School-Specific MBA Forum
  
   It is currently 05 Jul 2015, 00:25
  
  ### GMAT Club Daily Prep
  
  #### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
  
  Customized
  for You
  
  we will pick new questions that match your level based on your Timer History
  
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  every week, we’ll send you an estimated GMAT score based on your performance
  
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  # Events & Promotions
  
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  # In a sequence of numbers in which each term after the first
  
  Author Message
  TAGS:
  Intern
  Joined: 19 Oct 2009
  Posts: 44
  Followers: 0
  
  Kudos [?]: 29 [0], given: 4
  
  In a sequence of numbers in which each term after the first [#permalink]  14 Nov 2009, 06:38
  00:00
  
  Difficulty:
  
  (N/A)
  
  Question Stats:
  
  100% (01:50) correct 0% (00:00) wrong based on 3 sessions
  In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term?
  
  (1) The first term is 1.
  (2) The sixth term minus the fifth term is 32.
  
  Yeah friends, I just solved it completely to know whether the info is sufficient. It took me nearly 3 minutes. I am horrified. Can this be solved within 2 mins through any formula or expression ? Please-please-please tell me. I am dying to know.
  Joined: 20 Aug 2009
  Posts: 312
  Location: Tbilisi, Georgia
  Schools: Stanford (in), Tuck (WL), Wharton (ding), Cornell (in)
  Followers: 14
  
  Kudos [?]: 103 [0], given: 69
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 06:48
  let the first term be x, then sequence looks like
  
  1 - x
  2 - 2x+1
  3 - 4x+3
  4 - 8x+7
  5 - 16x+15
  6 - 32x+ 31
  
  (1) if x=1, then 5th term = 31, SUFFICIENT
  
  (2) if (32x+31)-(16x+15) = 16x+16 = 32; x=1; 5th term = 31; SUFFICIENT
  
  hence D
  
  It shouldn't took more than 2 minutes IMO
  Manager
  Joined: 13 Oct 2009
  Posts: 115
  Location: USA
  Schools: IU KSB
  Followers: 4
  
  Kudos [?]: 60 [0], given: 66
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 06:56
  gmat620 wrote:
  In a sequence of numbers in which each term after the first term is 1 more than twice the preceding term, what is the fifth term?
  
  (1) The first term is 1.
  (2) The sixth term minus the fifth term is 32.
  
  Yeah friends, I just solved it completely to know whether the info is sufficient. It took me nearly 3 minutes. I am horrified. Can this be solved within 2 mins through any formula or expression ? Please-please-please tell me. I am dying to know.
  
  Question stem says - nth term =2* (n-1)th term +1
  fifth term =?
  
  1) first term = 1
  second term = 2*first term+1
  and so on.... you can find fifth term using the above formula but you don't really have to calculate.
  
  SUFFICIENT
  
  2) sixth term - fifth term = 32
  
  sixth term = 2* (fifth term) +1
  
  you can find fifth term here. SUFFICIENT
  
  Joined: 20 Aug 2009
  Posts: 312
  Location: Tbilisi, Georgia
  Schools: Stanford (in), Tuck (WL), Wharton (ding), Cornell (in)
  Followers: 14
  
  Kudos [?]: 103 [0], given: 69
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 07:26
  yeah, it's important to remember that in DS questions you get no additional points for calculating something. You should only show wether it's possible to calculate (given this amount of info) or not.
  Manager
  Joined: 20 May 2009
  Posts: 61
  Followers: 1
  
  Kudos [?]: 12 [0], given: 3
  
  Re: O man I don't know the shortcut for this one [#permalink]  14 Nov 2009, 16:49
  IMO D...
  Statement 1 : Sufficient, because 1st term is given you can find the fifth term(no need to actually calculate it).
  Statement 2 : Sufficient, let fifth term be X, therefore sixth term=2X+1=>2X+1-X=32=>x=31
  
  Would take less than a minute..
  Re: O man I don't know the shortcut for this one   [#permalink] 14 Nov 2009, 16:49
  Similar topics Replies Last post
  Similar
  Topics:
  1 Each number after the first number in the sequence is 4 less than the 2 07 Sep 2014, 03:22
  10 In the sequence S of numbers, each term after the first two 5 26 Feb 2014, 01:21
  In the sequence S of numbers, each term after the first two 3 30 May 2011, 04:54
  2 After the first term, each term in a sequence is five times 3 27 Oct 2010, 17:44
  In a sequence of numbers in which each term after the first 2 31 May 2007, 05:42
  Display posts from previous: Sort by
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: Similar topics Replies Last post
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  # In a sequence of numbers in which each term after the first
  
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