Question 51

Find the number that can replace the question mark in the series given below: 15, 18, 17, 21, 20, 25, 24, 30, 29, ?

Solution

We are given the series as : 15, 18, 17, 21, 20, 25, 24, 30, 29

If we pair them, we get: 15, 18), (17, 21), (20, 25), (24, 30), (29, ?)

1st pair: 15 → 18 (Adding 3)

2nd pair: 17 → 21 (Adding 4)

3rd pair: 20 → 25 (Adding 5)

4th pair: 24 → 30 (Adding 6)

5th pair: 29 → ?

Following the pattern, we should add 7 to get the other number in the 5th pair.

Hence, the missing number is 29+7 = 36

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