Question 1

Find the wrong number in the given series. 12, 18, 27, 42, 62, 87

Solution

12, 18, 27, 42, 62, 87

difference is multiple of 5

$$12+ 5 = 17$$

$$17+ 10 = 27$$

$$27+ 15 = 42$$

$$42+ 20 = 62$$

$$62+ 25 = 87$$

so the wrong no. is 18

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