Question

Complete the following series:

2, 9, 28, ?, 126, 217, 344

• A. 50
• B. 65
• C. 70
• D. 82

Answer 1

Answer: (B)

65

This series can be obtained by taking cube from 1 and adding 1 to them as follows

$1^3+1=2$

$2^3+1=9$

$3^3+1=28$

$4^3+1=65$

$5^3+1=126$

$6^3+1=217$

$7^3+1=344$

Hence 65 replaces question mark.