Find the wrong number in the given series. 12, 18, 27, 42, 62, 87
12, 18, 27, 42, 62, 87
difference is multiple of 5Â
$$12+ 5 = 17$$
$$17+ 10 = 27$$
$$27+ 15 = 42$$
$$42+ 20 = 62$$
$$62+ 25 = 87$$
so the wrong no. is 18
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