Find the odd man out. 2, 5, 10, 17, 26, 37, 50, 64
Answer: D
(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.