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Q.

A bag contains 5 red, 3 black balls and a second bag contains 4 red and 5 black balls. One of the bags is chosen at random and a draw of two balls is made from it. Find the chance that one is red and the other is black

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a

1556

b

518

c

275504

d

229504

answer is C.

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Detailed Solution

P(1R or 1B)=12.5C1.3C18C2+12.4C1.5C19C2=275504
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