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Annie12345 Annie12345
  • 17-05-2014
  • Mathematics
Answered

Why are all 6 digit Fredholl numbers composite

Verified Answer :

mackiemesser
mackiemesser mackiemesser
  • 22-05-2014

In 6-digit fredholl number, all numbers must consist of three digits A, and three digits B.
So a sum of their digits is 3A+3B
3A+3B=3(A+B) and this number is divisible by 3,
Therefore any 6-digit fredholl number is divisible by 3. 
If a number is divisible by any other number than 1 and itself, we call that number a composite number.

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