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How many distinct odd-digit numbers can be written with the digits 1,2,3, 4 and 5 if no digit may be used more than once?

 Apr 11, 2021
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The digits from right to left

3*4*3*2*1  +    3*4*3*2   +   3*4*3  +  3*4   +  3  

 Apr 12, 2021
edited by Melody  Apr 12, 2021

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