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How many 4-digit numbers can be made from the digits 2, 3, 4, 5, 6, 7 if no digit is repeated in the same number?
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How many 4-digit numbers can be made from the digits 2, 3, 4, 5, 6, 7 if no digit is repeated in the same number?

User Jarek
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7 votes
THis equals the number of permutations of 4 from 6.

= 6P4 = 6! / (6 - 4)! = 6! / 2! = 720/2 = 360 answer
User AFract
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