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Anand Shukla Grade:
        a bag contains 4 balls. two balls are drawn at random and found to be white. what is the probability that that that the bag contained all 4 white balls ?
7 years ago

Answers : (1)

shael shekhawat
16 Points
										

E1 = ALL 4 R WHITE(WWWW)


E2= 3 WHITE 1 BLACK            


E3 = 2 W AND 2 Black


each of these events hve equal prob.=1/3


let the event of withdrawing 2 white balls be A



now P(A/E1)=2C2/4C2


P(A/E2)=3C2/4C2


P(A/E3)=4C2/4C2


now apply bayes theorem


P(E3/A)= (P(E3)*P(A/E3))    /    P(E3)P(A/E3) + P(E2)P(A/E2)  + P(E1)P(A/E1)


THE ANS IS 3/5


7 years ago
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