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?

13 years ago

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

13 years ago

Answered by andrew

8 years ago

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