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Help with Counting in Algebra5

label Algebra
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A certain lock has four tumblers, and each tumbler can assume five positions. How many different possibilities are there?

Dec 1st, 2014

5C4= 5! / (5-4)!*4!

       = 5! / 1!*4!

       = 5*4! / 1*4!

       = 5 ways

Dec 1st, 2014

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