the interest on an investment varies directly as the rate of of interest. if interest is $47 when interst rate is 5% find the in
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You have 10 numbers to choose from, and you're choosing 4 from that pool. Order of the numbers matters, because having 1234 as a PIN is not the same having it be 1324, so we're counting the number of permutations of 10 digits taken 4 at a time. So there are
possible PINs that can be made.