The sequence a1, a2, a3, a4. a5 is such that an = a n-1 +5 for 2≤ n ≤ 5. If a5 = 39 what is the value of a1 ?
Choose the correct choice from the following answers:  A) 1  B) 6  C) 19  D) 16  E) 21
Here, each value of an is the previous value plus 5   Since the numbers are less, the fastest way to solve this problem is to successively subtract 5 from a5 till you reach a1   a5 = 39   a4 = 34   a3 = 29   a2 = 24   a1 = 19 &lt;&lt;&lt;&lt; Ans 19
<result>C</result>
The sequence a1, a2, a3, a4. a5 is such that an = a n-1 +5 for 2≤ n ≤ 5. If a5 = 39 what is the value of a1 ?