Instructions

In each of these questions, a number series is given. Only one number is wrong in each series. You have to find out the wrong number

Question 1

10, 15, 24, 35, 54, 75, 100

Solution

Let us find the difference between consecutive terms of the series.
The numbers in the series are 10, 15, 24, 35, 54, 75, 100
And their differences are 5, 9, 11, 19, 21, 25. There is no obvious pattern in this.

But if we replace 35 with 37, we see the following numbers 10, 15, 24, 35, 54, 75, 100
And the differences are 5, 9, 13, 17, 21, 25 which is a symmetric pattern.

Hence, the term which is wrong in the series is 35

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