9.A bag has 4 white balls and 6 black balls of equal size.A ball is drawn without looking.what is the probality of (1) getting a black ball (II) getting a white ball. 1 2?
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4 w, 6b
total balls = 10
1) p(one black ball) = 6c1/10c1 = 3/5
p(2 black) = 6c2/10c2 = 6×5/10×9 = 1/3
2)p(one white ball) = 4c1/10c1 = 2/5
p(2 white) = 4c2/10c2 = 4×3/10×9 = 2/15
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Answer:
Total balls = 10
Probability= Number of favourable outcome/Total
no. of outcomes
P(black ball) =6/10
=3/5
P(white ball)=4/10
=2/5
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