Multiple choice Find the wrong number of the following number series. 2, 9, 64, 645, 7776, 117649 645 64 7776 9 None of these Reveal answer Fill a bubble to check yourself A Correct answer Explanation The pattern is: 2^1=2, 3^2=9, 4^3=64, 5^4=625, 6^5=7776, 7^6=117649. The term 645 breaks this pattern as 5^4=625, not 645. Option A correctly identifies 645 as the wrong number.