# Ten students are

To find: number of ways of winning the first three prizes.

The first price can go to any of the 10 students.

The second price can go to any of the remaining 9 students.

The third price can go to any of the remaining 8 students.

Formula:

Number of permutations of n distinct objects among r different places, where repetition is not allowed, is

P(n,r) = n!/(n-r)!

Therefore, a permutation of 10 different objects in 3 places is

P(10,3) =

= = = 720.

Therefore, there are 10 × 9 × 8 = 720 ways to win first three prizes.

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