Yuehui Z.

# How many 4-digit numbers can be formed using 5, 6, 7 and 8 if the digits cannot be repeated?

How many 4-digit numbers can be formed using 5, 6, 7 and 8 if the digits cannot be repeated?
If they are 3-digit numbers to be formed, they will be 4!=24. How about 4-digit numbers?
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