Find the number of permutations of 10 things taken 7 at a time.

10 P 7. plug into you calculator to solve or use the formula:  

n P r = n! / (n - r)!  

so 10! / 3! = 10x9x8x7x6x5x4x3x2x1 / 3x2x1 = 10x9x8x7x6x5x4 = 604,800.

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answer