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A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:
A1/22
B3/22
C2/91
D2/77
Show Explanation
= (15*14*13)/(3*2*1)
= 455
n(E) = probability of getting red ball = 5c3
= (5*2*1)/(3*2*1)
=10
P(getting red ball)= n(E)/n(s)
= 10/455
= 2/91
Asked In ::
n(s)= probability of drawing three balls out off 15 balls = 15c3
= (15*14*13)/(3*2*1)
= 455
n(E) = probability of getting red ball = 5c3
= (5*2*1)/(3*2*1)
=10
P(getting red ball)= n(E)/n(s)
= 10/455
= 2/91
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