6 wht, 4 grn, 2 yellow marbles; 3 drawn w/o replacement

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wilber123

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A bowl contains 6 white,4 green, and 2 yellow. Asample of 3 marbles are drawn at random without replacement. Find the probability that the sample contains the following:

Exactly 2 white marbles

(6 nCr 2)(6 nCr 1)/220 = (15)(6)/220 = 90/220 = .409

I used combinations for this dunno if thats correct. Maybe Binomial?


At most 2 white marbles

For this one I would think it would be the same as the one above so thats why I am really thrown off.



Thanks in advance for the help
 
Re: Marbles in a bowl

wilber123 said:
A bowl contains 6 white,4 green, and 2 yellow. Asample of 3 marbles are drawn at random without replacement. Find the probability that the sample contains the following:

Exactly 2 white marbles

(6 nCr 2)(6 nCr 1)/220 = (15)(6)/220 = 90/220 = .409

I used combinations for this dunno if thats correct. Maybe Binomial?


At most 2 white marbles = exactly 0 white marbles + exactly 1 white marble + exactly 2 white marble = 1 - exactly 3 white marbles
For this one I would think it would be the same as the one above so thats why I am really thrown off.



Thanks in advance for the help
Click to expand...
 
Re: Marbles in a bowl

Thanks for the help.

How does my work look on the

Exactly 2 white marbles?

Thanks again
 
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