How Many Selections of 3 Cards
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How Many Selections of 3 Cards

[From: ] [author: ] [Date: 12-06-12] [Hit: ]
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A box has 9 red cards, 6 white cards and 2 blue cards. How many selections of 2 cards can be made so that (a) both cards are red and (b) none is red?

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there are 9 red & 8 non-red cards

a. 9c2 = 36 <-----

b. 8c2 = 28 <----

this is a pretty basic q !
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