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An old website requires a four-character password consisting of three numbers and one letter. A new...

An old website requires a four-character password consisting of three numbers and one letter. A new website requires a six-character password consisting of three numbers and three letters. How many more passwords can be made for the new website? I think we are using combinations and permutations, but im not sure. Please explain each step! Thanks!

Math   Statistics-And-Probability   
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TOPIC:Permutation and Combination.

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