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Consider an urn in which 4 balls have been placed by the following scheme : A fair coin is tossed; if the coin falls head, a white ball is placed in the urn, and if the coin falls tail, a red ball is placed in urn. ( i )What is the probability that the urn will contain exactly3 white balls ?

Consider an urn in which 4 balls have been placed by the following scheme : A fair coin
is tossed; if the coin falls head, a white ball is placed in the urn, and if the coin falls tail, a red
ball is placed in urn. (i)What is the probability that the urn will contain exactly3 white balls ?
 

Grade:12th pass

1 Answers

Athul
20 Points
6 years ago
Probability of No of white balls being 3 is same as probability of getting 3 heads ......To find the p (3 heads): n(3H)/n(S). = 4/16=1/4..... And:1/4

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