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What should come in the place of question mark '?' in the following number series ?

81, 80, 88, 61, 125, ?


5. None of these

1 Answer

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Best answer
Correct Answer - Option 1 : 0

Considering the above series,

81, 80, 88, 61, 125, ?

The logic of the series can be explained as:

81 – 13 = 80

80 + 23 = 88

88 – 33 = 61

61 + 43 = 125

By observing the pattern, we can write

⇒ 125 – 53 = ?

⇒ ? = 0

∴ The value of ? is 0.

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