Question

How many $2$-digit even numbers can be formed from the digits $1,2,3,4,5$ if the digits , can be repeated ?

Answer 1

Given : $1,2,3,4,5$ digits ($5$ digits)

To find : $2$-digit even numbers

T U

$\downarrow$ $\downarrow$

$5$ ways $2$ ways

$\therefore$ Required $2$- digits- even number

$=5\times 2=10$