A school bag contains 12 pens of which 5 are red and the other are black. 4 pens are selected from the bag. How many different samples of size 4 pens are possible? (b) How many samples have 3 red pens and 1 black pen? (c) How many samples of size 4 contain at least two red pens?
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A school bag contains 12 pens of which 5 are red and the other are black.
4 pens are selected from the bag.
- How many different samples of size 4 pens are possible?
(b) How many samples have 3 red pens and 1 black pen?
(c) How many samples of size 4 contain at least two red pens?
(d) How many samples of size 4 contain at most one black pen?
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