In how many different ways can a winner and a runnerup of a

In how many different ways can a winner and a runner-up of a contest be chosen from a total of 15 contenders?

Solution

here we find different ways can a winner and a runner-up of a contest be chosen from a total of 15 contenders.

then number of ways = ¹⁵C₁ * ¹⁴C₁ = 210