4.3 Permutations With Some Identical Items Refer to the Key Concepts on page 244. 8. How many different ten-digit telephone numbers contain four 2s, three 3s, and three 7s?
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Since each digit can be any number from 0 to 9, there are 10 options for each digit. Therefore, the total number of possible ten-digit telephone numbers is 10^10. Show more…
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