Mathematics, 17.10.2021 09:20 cjade7660
In how many ways can we pick a group of 3 different numbers from the group 1, 2, 3..., 500 such that one number is the average of the other two? (The order in which we pick the numbers does not matter).
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In how many ways can we pick a group of 3 different numbers from the group 1, 2, 3..., 500 such that...
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