text: Krishna
  0
  
  (i)
  
  Step 1:  Examine the summation
  
  EXAMPLE:  \sum_{r=1}^{5} a_r = a_1 + a_2 + a_3 + a_4 + a_5
  
  Step 2: Make sure that the given set of numbers arranged in some particular order. Because the question says that the set of numbers in sequence.
  
  Step 3: Explore the given rule
  
  EXAMPLE: x_{n+1} = ax_n - 3
  
  Succeeding term = a (preceding term) - 3
  
  Step 4: According to the given rule substitute the (n)values.
  
  [NOTE: To find the twenty-first term, replace n(any variable represents position) by 21. based up on the rule it(n) may change to lower value or higher value]
  
  EXAMPLE: For an attempt to find the x_2 substitute n=1 in the given rule
  
  x_{n+1} = ax_n - 3
  
  x_2 = ax_1 - 3
  
  Substitute the values x_1 [ take x_1 = 1 since n >1), Some times it mention
  
  in the question]
  
  x_ 2 = a(1) - 3
  
  x_2 = a - 3
  
  Step 5: Simplify further
  
  (Apply the BODMAS rules)
  
  Step 6: Repeat the same steps to calculate all the values of  a_1, a_2, a_3, a_4, a_5 ...and add them
  
  (ii)
  
  Step 7: Divide the summation value by 10
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