A hall has 12 gates. In how many ways can a man enter the hall through one gate and come out through a different gate?

Options

A. `23`
B. `132`
C. `12`
D. `110`

Answer

B

Explanation

Since, there are 12 ways of entering into the hall. After entering into the hall, the man come out through a different gate in 11 ways.
Hence, by the fundamental principal of multiplication, total number of ways is `12xx11=132` ways.