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Question

The total number of ways of selecting six coins out of 20 one rupee coins, 10 fifty paise coins and 7 twenty five paise coins, is:

A
26
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B
28
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C
56
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D
52
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Solution

The correct option is A 28
If we are given n types of objects, out of them r objects to be selected. Then the formula to select them is (n+r1)Cr.
For the given problem we are having n=3, r=6.
So, number of ways =3+61C6=8C6=28.
So, option (B) is correct.

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