2023 SJI P2 Q7

2023 SJI P2 Q7

IB Year 5 | Grade 11
5 marks

Let \(S\) be the set of positive integers \(\{1,2,3,\ldots,28,29,30\}\).

Three different positive integers are selected from \(S\).

Find the number of selections that result in a sum that is divisible by \(3\).[5]

Solution:

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Answer:\(1360\)

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