Answer : 1. "12"
Explanation :

Answer: A) 12 Explanation: The given series follows a pattern that,   4 + 32 = 4 + 9 = 1313 + 52 = 13 + 25 = 3838 + 72 = 38 + 49 = 8787 + 92 = 87 + 81 = 198    Hence, the odd man in the given number series is 12.