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Mathematics, 26.05.2021 19:30 nocomprendoplshelp
Part 1: How many phone numbers can be made if all the digits (that is, 10 digits) need to be filled in and any single digit number (0-9) can be used for any digit? Part 2: How many phone numbers can be made if the first digit must be 1, the second digit must be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last seven digits can be any single digit number 0-9?
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Part 1: How many phone numbers can be made if all the digits (that is, 10 digits) need to be filled...
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