In the Following Series of Numbers, Find Out the Missing Number:

50, 65, (..), 101, 122.

  1. 73
  2. 82
  3. 89
  4. 93
Monis Rasool Professor Asked on 30th June 2015 in Reasoning Questions.
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  • 1 Answer(s)

    Correct answer should be = 82

    Explanation: In given series 50, 65, … , 101, 122 there is a difference between two adjacent numbers. And this difference also forms a Arithmetic Progression series.

    Let us consider desired number is ‘x’.

    Difference between two adjacent number of this series is given below:
    65 – 50 = 15
    x – 65 = ?
    101 – x = ?
    122 – 101 = 21

    There is a difference of 6 (21-15). So by taking two numbers between 15 and 21 we get = 17 and 19
    Let us put it in the series we,
    50, 65, 82, 101, 121

    Difference between number of series will be 15, 17, 19 and 21.

    Pushpendra Pal Dean Answered on 30th June 2015.
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