Posted by **RAMATU** on Monday, March 15, 2010 at 7:37pm.

A BAG CONTAINS 3 RED CHIPS, 2 BLUE CHIPS AND 1 WHITE CHIP. IF 2 CHIPS ARE CHOSEN FROM THE BAG WITHOUT REPLACEMENT DETERMINE THE PROBABILITY THAT THEY ARE OF DIFFERENT COLORS

- PRE CAL. JOURNAL -
**MathMate**, Monday, March 15, 2010 at 9:41pm
You can calculate the different combinations to get different colours, but you can also calculate the probability P of getting the same colours, and the required probability is 1-P.

get two reds: (3/6)*(2/5)=1/5

get two blues: (2/6)*(1/6)=1/18

Probability of getting two reds or two blues: (1/5)+(1/18)=23/90

Probability of not getting two of the same colour = 1-(23/90)=67/90

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