Question 145

Select the number from the given options that can replace the question mark (?) in the following series.
4, 12, ?, 60, 124, 252

Solution

4 = 4*1

12=4*3

? = 4*x

60=4*15

124=4*31

252=4*63

Here, every number is a multiple of 4. The multiple in the second term is one more than the twice of the previous multiple.

3 = 1*2+1

31 = 15*2+1

63 = 31*2+1

x=3*2+1

x=7

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Select the number from the given options that can replace the question mark (?) in the following series.4, 12, ?, 60, 124, 252