How many four digit without repetition can be formed using the digit 1,2,3,4,5,6,7,8?
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The question can be simplified into choosing any 4 digits out of 1,2,3,4,5,6,7,8 to create a 4 digit number
So, I think the answer is
8P4
=1680
So, I think the answer is
8P4
=1680
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