Question

Find the units digit of the expression ${25}^{6251}+{36}^{528}+{73}^{54}$.

• A. 4
• B. 6
• C. 5

Answer 1

The units digit would be given by 5 + 6 + 9 (numbers ending in 5 and 6 would always end in 5 and 6 irrespective of the power and $3^{54}$ will give a units digit equivalent to $3^{4n+2}$ which would give us a unit digit of $3^2$ i.e. 9).