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OpenStudy (rmpjingwei):
A set of four distinct numbers are chosen from the set {1,2,3…9,10,11}. How many ways can this set of 4 numbers be chosen such that the sum is divisible by 3? Choosing the numbers {1,2,3,6} is the same as choosing the numbers {6,3,2,1}.
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OpenStudy (anonymous):
hint:: leaving remainder 0 are 3,6,9 leaving remainder 1 are 1,4,7,10 leaving remainder 2 are 2,5,8,11
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