General Intelligence Number Series Number Series Question #6539 (CAT-I)

Find the missing term in the series: 3, 5, 9, ?, 33, 65

A 17
B 21
C 23
D 25
Correct Answer & Explanation
Option A
The terms follow the pattern of powers of 2 plus 1 (2ⁿ + 1): 2¹ + 1 = 3 2² + 1 = 5 2³ + 1 = 9 2⁴ + 1 = 17 2⁵ + 1 = 33 2⁶ + 1 = 65 • Hence, the missing term is 17.