Question

The digit in the units place of the number $2015!+3^{7886}$ is

• A. $1$
• B. $3$
• C. $7$
• D. $9$

Answer 1

The correct option is D $9$

$2015!+3^{7886}$

$2015!\Rightarrow$ Unit digit $\Rightarrow \underset{–}{0}$

$3^{7886}=3^{4n+2}$, So unit digit $\Rightarrow 9$

$\therefore 0+9\Rightarrow \underset{–}{9}$.

$\therefore$ Digit at unit place $\Rightarrow 9$