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could we get the answer by judging the sum of any 3 integers
I just come out an idea that, whether any 3 intergers whose sum could be divided by 3, can also make a product divided by 3?
take the answer A for instance, n+n+1+n-4=3n-3, can be divided by 3.
for the other 4 answers, no one can meet the above rules.
- by alina_linlin
Fri Feb 13, 2009 11:17 pm- Forum: Problem Solving
- Topic: If n is an integer greater than 6 + divisibility question
- Replies: 29
- Views: 18739