Question 1

Identify the wrong number in the following series--
216, 163, 120, 72, 24

Solution

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The series from the right is 24 x 1, 24 x 3, 24 x 5, 24 x 7 and 24 x 9.

For example,
24 x 1 = 24
24 x 3 = 72
24 x 5 = 120
24 x 7 = 168
24 x 9 = 216

So, the wrong number is 163. The correct number is 24 x 7 = 168

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