What should come in place of the question mark (?) in the given series?
6 9 15 24 36 ?

The correct answer is 51 (Option 1).

To find the missing number in the given series, let us analyze the differences between consecutive terms:

Given series: 6, 9, 15, 24, 36, ?

Let us calculate the difference between each adjacent pair of numbers:

9 - 6 = 3

15 - 9 = 6

24 - 15 = 9

36 - 24 = 12

Notice the pattern in the differences: 3, 6, 9, 12. The differences are increasing by 3 each time (or are multiples of 3).

Following this pattern, the next difference should be:

12 + 3 = 15

To find the missing term (?), we add 15 to the last given number (36):

36 + 15 = 51

Thus, the number that should come in place of the question mark (?) is 51.