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OpenStudy (anonymous):
how many different ways can you display 4 books from a list of 10 books on a shelf
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OpenStudy (anonymous):
10 choices for first book 9 for the second 8 for the third 7 for the fourth by the counting principle the number of ways to do this is \[10\times9\times 8\times 7\]
OpenStudy (shamim):
its permutation
OpenStudy (shamim):
10P4
OpenStudy (lncognlto):
Yep, 10 x 9 x 8 x 7, for four books out of 10...
OpenStudy (shamim):
10!/(10-4)!
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