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4*3*2*1 = 24
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Earn +20 ptsQ: How many 2-digit numbers can you mak using 1 2 3 4 only once?
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How many 3 digit numbers can you make using the numbers 1 5 and 9 only using them once in every number?
3! = 6.
How many 9 digit numbers using 1-9 once are prime?
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How many 3 digit numbers can be formed using only 1467 without using it more than once?
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