Explanation

The pattern in the series is obtained by adding 1 to the square of consecutive integers:

(1 × 1) + 1 = 2

(2 × 2) + 1 = 5

(3 × 3) + 1 = 10

(4 × 4) + 1 = 17

(5 × 5) + 1 = 26

(6 × 6) + 1 = 37

(7 × 7) + 1 = 50

(8 × 8) + 1 = 65 (not 64)

So, the odd one in the series is: 64 (should be 65)

The correct series would be: 2, 5, 10, 17, 26, 37, 50, 65