Instructions

What should come in place of the question mark (?) in the following numbers series ?

Question 125

121 ? 81 64 49 36 25

Solution

Here, 81 64 49 36 25
81 - 64 = 17
64 - 49 = 15
49 - 36 = 13
36 - 25 = 11

Therefore, the difference is in arithmetic progression with common difference of 2.
Hence,
x - 81 = 19
x = 100
Therefore, the correct option is option D.

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IBPS Clerk 2011 1st Shift

121 ? 81 64 49 36 25

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