Question 28

Select the number that can replace the question mark (?) in the following series.

5, 3, 3, 5, 15, ?

Solution

The logic here is

5 x 1 - 2 = 3

3 x 2 - 3 = 3

3 x 3 - 4 = 5

5 x 4 - 5 = 15

Similarly, the next number in the series = 15 x 5 - 6 = 69

Hence, the correct answer is Option C

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