Some tennis balls are to be put into 7 boxes such that each box contains at least one ball. At the m….

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Some tennis balls are to be put into 7 boxes such that each box contains at least one ball. At the most, 3 of the boxes are to contain the same number of balls, and no two of the remaining boxes are to contain an equal number of balls. What is the least possible number of tennis balls needed for the boxes?

Options :-

1. 7
2. 13
3. 17
4. 19
5. 22

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