Subject
Quantitative Aptitude
Topic
Probability
A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.
A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.
ক)
1/2খ)
7/15গ)
8/15ঘ)
1/9Explanation
Let S be the sample space Then n(S) = no of ways of drawing 2 balls out of (6+4) = 10 c 2 10= =45 Let E = event of getting both balls of same colour Then,n(E) = no of ways (2 balls out of six) or (2 balls out of 4) = 6 c 2 + 4 c 2 = = 15+6 = 21 Therefore, P(E) = n(E)/n(S) = 21/45 = 7/15Related questions
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