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How many ways are there to select four pieces of fruit from a bowl containing apples, oranges, and pears if the order in which the pieces are selected does not matter, only the type of fruit and not the individual piece matters, and there are at least four pieces of each type of fruit in the bowl?
in Graph Theory
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15??
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I got 15 is it Answer
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Probably you are doing C(4+3-1,3-1) = 15.

But I think, it should be 6 as according to the question:-

only the type of fruit and not the individual piece matters

If we follow this constraint, then there are 6 different ways to select pieces {O, A, P, OA, OP, OAP}.

But I am not sure.  

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