A box contains 6 red balls, 4 yellow balls and 2 green balls. the colours of the balls are mutually exclusive. what is the probability that when a ball is is drawn.

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a) the ball is red
b) either yellow or green

A box contains 6 red balls, 4 yellow balls and 2 green balls. the colours of the balls are mutually exclusive. what is the probability that when a ball is is drawn.

6 red
4 yellow
2 green
a) probability of the red balls
frac{6}{12} = frac{1}{2}
b) probability either yellow or green
frac{4}{12} + frac{2}{12} = frac{6}{12} = frac{1}{2}