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Examples of Permutations of less than all

Permutations of less than all

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A permutation is an arrangement in which order is important. The notation for permutations is P(n,r) which is the number of permutations of "n" things if only "r" are selected.
**natttt***Posted on 2011-03-22 00:01:06*

One example: If nine students take a test and all have different scores, the highest score could be achieved by any of the nine students. The second highest score could be achieved by one of the remaining 8 students. The third highest score could be achieved by one of the 7 remaining students.

The number of possible permutations would be: P(9,3) = 9*8*7 = 504 possible arrangements of the top three scores.

More examples of permutations:

P(8,3) = 8*7*6 = 336

P(4,2) = 4*3 = 12

P(n,r) = n*(n-1)*(n-2)... to r factors

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