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N=1991*1993*1995*1997*1999 What is the sum of the hundreds, tens and units digits of N?

 

Find the smallest positive multiple of 21 that has no digit larger than 1.

 

What is the smallest positive integer n such that the rightmost three digits of n! and (n+1)! are the same?

 Oct 17, 2020
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1, The sum of the hundreds, tens and units digits of N is 1 + 9 + 5 = 15.

 

2. The smallest positive multiple of 21 that has no digit larger than 1 is 1100001.

 

3. The answer is n = 120.

 Dec 18, 2020

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