MathDB

A even not divisible by 10, last 2 digits of A^20 (HOMC 2013 J Q4)

Source:

July 25, 2019

lastDigitsnumber theory

Problem Statement

Let

A

be an even number but not divisible by

10

. The last two digits of

A^{20}

are:
(A):

46

, (B):

56

, (C):

66

, (D):

76

, (E): None of the above.