Answer : 1 189 Explanation : Answer: A) 189 Explanation: The given number series is 10, 21, 54, 109, 189The series follows a pattern that10 11 = 2121 33 = 5454 55 = 109109 77 = 186 Hence the wrong number in the given number series is 189.

**Click here to see the full blog post**

**last edited by**