a bag contain 8 red, 10 blue and 12 black balls. if one ball is drawn at random,find the probability that it is black.
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n(S)=8+10+12
n(S)=30
n(black balls)=12
p(black balls)=12/30
p(black balls)=2/5
n(S)=30
n(black balls)=12
p(black balls)=12/30
p(black balls)=2/5
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12/30 is probability of getting black ball
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