General Intelligence Number Series Number Series Question #6537 (CAT-I)

Find the missing number in the following series: 1, 3, 6, 11, 18, ?

A 25
B 27
C 29
D 31
Correct Answer & Explanation
Option C
The differences between consecutive numbers are consecutive prime numbers: 1 + 2 = 3 3 + 3 = 6 6 + 5 = 11 11 + 7 = 18 18 + 11 = 29 • Therefore, the missing term is 29.