Question 50

Identify the number that does NOT belong to the following series.

81, 54, 36, 27, 22

Solution

81 - 54 = 27

54 - 36 = 18

36 - 27 = 9

The difference of consecutive numbers is the decreasing multiple of 9. The next difference should be 0.

Similarly, the next number in the series = 27 + 0 = 27

The required series should be 81, 54, 36, 27, 27

$$\therefore\ $$22 do not belong to the series.

Hence, the correct answer is Option C

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