Which of the following numbers will replace the question mark (?) in the given series?
28, 29, 31, 35, 43, ?

Given: 28, 29, 31, 35, 43, ?

Find the pattern in the differences

29−28=1

31−29=2

35−31=4

43−35=8

The differences are: 1,2,4,8.

This shows a pattern of doubling at each step.

The next difference should be

8×2=16.

Add the predicted difference to the last term

43+16=59.

Correct answer is (D) 59