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Question

A series is given with one term wrong. Select the wrong term from the given alternatives.

987, 983, 975, 963, 947, 927, 905, 875

The correct answer is

905

Examine the differences between consecutive terms, which should decrease steadily.

987 to 983 is -4, 983 to 975 is -8, 975 to 963 is -12, 963 to 947 is -16, 947 to 927 is -20.

The gaps grow by 4 each time: -4, -8, -12, -16, -20, so the next gap must be -24.

927 - 24 = 903, but the series shows 905, so 905 breaks the pattern.

Checking onward, 903 - 28 = 875 fits the last term, confirming 905 is the odd one.

Hence the wrong term in the series is 905.

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