Find out the wrong term in the given series.
$4, 6, 15, 56, 280, 1644$

280

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1644

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56

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15

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Solution

The correct option is A $280$
In the given series
$4 \times 2 - 2 = 8 - 2 = 6$
$6 \times 3 - 3 = 18 - 3 = 15$
$15 \times 4 - 4 = 60 - 4 = 56$
$56 \times 5 - 5 = 280 - 5 = 275$
$275 \times 6 - 6 = 1650 - 6 = 1644$
Thus, the series is $4, 6, 15, 275, 1644$
So the wrong term is $280$ .
Hence, option 'A' is correct.

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