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April 10th, 2011, 08:24 AM   #1
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Combination and Permutation

Combination MAth Problem?

we have 5 red pens, 4 green pens,and 2 blue pens

How many different ways can we choose 2 of these pens to buy if
a, the order is important
b, the order is not important
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April 10th, 2011, 01:46 PM   #2
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Re: Combination and Permutation

Hello, daivinhtran!

Quote:
We have 5 red pens, 4 green pens,and 2 blue pens.
[color=blue]I assume that the pens are identical except for color.[/color]

How many different ways can we choose 2 of these pens to buy if:

[color=beige]. . [/color](a) the order is important.


[color=beige]. . [/color]

[color=beige]. . [/color]


[color=beige]. . [/color]


[color=beige]. . [/color]






Quote:
( b) the order is not important.





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