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Answer on Combinatorics | Number Theory Question for arjay

Question #12087
how many 4 digits numbers can we make using the digits 3,6,7 and 8 without repetitions?
Expert's answer
3, 6, 7 and 8 are different and non-zero so we can make 4!
numbers.

3678
3687
3768
3786
3867
3876
.......
8763

4!
= 1*2*3*4 = 24

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