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  • Question
  • Find by how much percentage the average of first 10 odd numbers (starting from 1) is greater than the last term ?


  • Options
  • A. 991/16 %
  • B. 900/19 %
  • C. 874/13 %
  • D. 719/17 %

  • Correct Answer
  • 900/19 % 

    Explanation

    First ten odd numbers form an arithmetic progression of the form
    1,3,5,7,9......
    here a = first term = 1
    d = common difference = 2
    Average of first n numbers = (2a + (n - 1)d)/2
    n th term of the AP = a + (n - 1)d
    Substituting a = 1, d = 2 and n = 10 in the above formulas
    average of first 10 numbers = 10
    10 th term of the AP = 19
    Therefore average of first 10 terms is 19 - 10 = 9 greater than
    the last term. Hence the average is greater than the sum by
    9/19 X 100 = 900/19 %

  • Tags: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO

    More questions

    • 1. 
      Who sits between G and D?

    • Options
    • A. H
    • B. D
    • C. F
    • D. E
    • Discuss
    • 2. Find the odd one out:

    • Options
    • A. 49
    • B. 36
    • C. 65
    • D. 100
    • Discuss
    • 3. 
      NA

    • Options
    • A. Ring
    • B. Tyre
    • C. Plate
    • D. Bangle
    • Discuss
    • 4. 
      NA

    • Options
    • A. Huge
    • B. Tiny
    • C. Heavy
    • D. Small
    • Discuss
    • 5. 
      15/20 ÷ 4/5 x 2/3 x 8/5 =?

    • Options
    • A. 0
    • B. 1
    • C. 3
    • D. 5
    • Discuss
    • 6. 
      NA

    • Options
    • A. Raft
    • B. Chariot
    • C. Sledge
    • D. Cart
    • Discuss
    • 7. 
      NA

    • Options
    • A. 729
    • B. 123
    • C. 423
    • D. 621
    • Discuss
    • 8. 
      NA

    • Options
    • A. 11
    • B. 8
    • C. 14
    • D. 66
    • Discuss
    • 9. 
      NA

    • Options
    • A. Iron
    • B. Mercury
    • C. Silver
    • D. Gold
    • Discuss
    • 10. MO : 13 11 :: HJ :?

    • Options
    • A. 19 17
    • B. 18 16
    • C. 8 10
    • D. 16 18
    • Discuss


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