Instructions

In the following number series, only one number is ‘‘wrong’’. Find out the ‘’wrong’’ number.

Question 13

128, 640, 981, 1199, 1324, 1388

Solution

Let us find the difference between consecutive terms of the series.

The terms are 128, 640, 981, 1199, 1324 and 1388
And the difference between consecutive terms is 512, 341, 218, 125, 64

We notice that if 981 is replaced by 983, the difference in the terms will be perfect cubes i.e 512, 343, 216, 125 and 64.
Hence, the number which is wrong in the series is 983

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128, 640, 981, 1199, 1324, 1388

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