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OpenStudy (anonymous):
how many four digit numbers can be made using 0-7 with no repeated digits allowed
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OpenStudy (raden):
0 till 7 there are 8 numbers the first digit can be chosen by 7 ways (1,2,3,4,5,6,7) now we have 7 numbers then the others can be chosen by (7P3) so, it is 7 * (7P3) = ...
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