There are 5 oranges, 6 apples and 7 mangoes in a fruit basket. In how many ways can a person make a selection of fruits from among the fruits in the basket?
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Total no. of selections possible= 5×6×7= 210 ways.
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Whenever it is not explicity mentioned that fruit and distint, We take them as identical. 0 or more orange can be selected from 4 identical oranges in (4+1)=5 ways. 0 or more apples can be selected from 5 identical apples in (5+1)=6 ways.
0 or more mangoes can be selected from 6 identical mangoes in 7 ways.
∴ Total no. of ways in which all of three types of fruits can be selected (the no. of any type of fruits may also be 0),
5×6×7=210,
But in these 20 selection, there is one selection where all fruits are 0, hence we reduce 1 selection.
∴ the required no. =210−1=209
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