Latest Self Aptitude Question SOLUTION: Urn A contains 3 red and 2 white marbles, Urn B contains 2 red and 5 white, an Urn is selected at random, a marble is drawn and put into the other Urn, then a marble is drawn from

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(#M40033881) SELF Numerical Ability question Keep an EYE

Urn A contains 3 red and 2 white marbles, Urn B contains 2 red and 5 white, an Urn is selected at random, a marble is drawn and put into the other Urn, then a marble is drawn from the second Urn,, probability that both marbles drawn are of same colour is ????

SONU GUPTA (10 years ago)

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puppy  (10 years ago)

(1/2*3/5*3/8) + (1/2*2/5*6/8) =21/80

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Dharmendra Singh  (10 years ago)

let A is the probability of select red marble from first ern,
B is the '' '' '' '' '' '' second ern,
probability to select one ern will be=1/2
so whole probability will be=A(~B)+B(~A)=(1/2*2/5*3/8)+(1/2*2/7*4/6)=9/80+2/21
so probability will be=.21,
also if we do for white probability will be same

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parul  (6 years ago)

Let Red coloured ball is selected from both.
3/5 from A placed into B,
Similarly, 2/7 from B placed to A
Now,Let White coloured ball is selected from both.
2/5 from A to B
Similarly, 5/7 from B to A.
So, P(RR) + P(WW)
=> (3/5) +*(2/7) + (2/5)*(5/7)
=> 16/35.ans..

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