Correct Answer: Option C
Let S be the sample space.
Then, n(S) = number of ways of drawing 3 balls out of 15
= 15C3
= (15 x 14 x 13)/(3 x 2 x 1)
= 455.
Let E = event of getting all the 3 red balls.
n(E) = 5C3 = 5C2 = (5 x 4)/ (2 x 1)
= 10.
P(E) = n(E)/ n(S) = 10/455 = 2/91
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