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Question

There are 4 oranges, 5 apples and 6 mangoes in a basket. In how many ways can a person make a selection when select at least one fruit from each kind?

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Solution

A fruit can be selected from basket in 5×6×71=209 ways

oranges alone can be selected in 4 ways

apples alone can be selected in 5 ways

mangoes alone can be selected in 6 ways
oranges and apples alone can be selected in 4×5=20 ways

apples and mangoes alone can be selected in 5×6=30 ways

mangoes and oranges alone can be selected in 6×4=24 ways

Required number of ways =209456203024=120 ways

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