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Asked by
jeff
How many 4-digit numbers can be formed using the numbers 5, 6, 7 and 8? How many of the 4-digit numbers are less than 7000?
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Answered by
Steve
Since there are 4 choices for each digit, there are 4^4 = 256 different numbers.
Only half of them begin with 5 or 6
Answered by
andrew
24
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