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+1 vote
13.4k views
in Mathematics by (6.2k points)

An urn contains 4 balls. Two balls are drawn at random from the urn (without replacement) and are found to be white. What is the probability that all the four balls in the urn are white ?

1 Answer

+3 votes
by (12.0k points)
selected by
 
Best answer

Let E1 : urn has 2 white balls

E2 : urn has 3 white balls

E3 : urn has 4 white balls

A : 2 balls drawn are white

by (10 points)
How P(E-1)=P(E2)=P(E3)=1

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