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Question

Find out the wrong number in the following series.

98, 79, 62, 47, 33, 23, 14

The correct answer is

33

Examine the differences between consecutive terms.

From 98 the differences should decrease by 2 each step: \(-19,-17,-15,-13,-11,-9\).

This gives the correct series 98, 79, 62, 47, 34, 23, 14.

The term after 47 should be \(47-13=34\), not 33.

So the wrong number in the series is 33.

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