1.  2, 5, 10, 17, 26, 37, 50, 64
A. 50
B. 26
C. 37
D. 64

Answer: Option D

Explanation:

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1

But, 64 is out of pattern