Question

In each of the questions below, a number series has been given followed by five alternatives. One term of the given number series is wrong. Find out the wrong term and spot a number from the alternatives which will replace the wrong term of the series.
7, 9, 17, 42, 91, 172, 293

• A. 16
• B. 25
• C. 36
• D. 8
• E. 49

Answer 1

The correct option is D 8

It is obvious from the given series that if 9 is replaced by 8 then the difference between successive terms will be in the order of $1^2,3^2,5^2,7^2,9^{2}and{11}^2$
Therefore, alternative (d) is the correct answer.