Question

How many even numbers are three digits such that if $5$ is one of the digits, then $7$ is the next digit?

Answer 1

(1)5 Not there ------0 2 4 6 8

--- 13 5 7 9

$8\times 9\times 5=360$

(2)5in there 5 7 =5

$\Rightarrow$ 360+5=365.