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what is the gcd of 2001 and 6837?

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2 Answers

2001 = 1*3*23*29
6837 = 1*3*43*53
                ↑  
              GCD
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If sum of all digits in the number is divisible by 3 or 9 that whole number is dividable by 3 or 9:
2+0+0+1=3
6+8+3+7=24

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