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.
169, 121, 80, 49, 25, 9, 1

• A. 100
• B. 81
• C. 36
• D. 16
• E. 273

Answer 1

The correct option is B 81

A careful scrutiny of the series reveals that if 80 is replaced by 81 then the series will be arranged in the order of
${13}^2,{11}^2,9^2,7^2,5^2,3^2,1^2$. Therefore, (b) is the correct alternative.