61, 66, 83, 121, 1855
Answer: B) 121 Explanation: Given number series is 61, 66, 83, 121, 185 Here the given series follows a pattern that, 6161 + 22 + 1 = 6666 + 42 + 1 = 8383 + 62 + 1 = 120 (not 121)120 + 82 + 1 = 185 Hence, the odd man in the given series is 121.