Q.

Let n1and n2 be the number of red and black balls respectively, in box I. Let n3 and n4  be the number of red and black balls, respectively, in box II.

One of the two boxes, box I and box II, was selected at random and a ball was drawn randomly out of this box. The ball was found to be red. If the probability that red ball was drawn from box II is 13, then the correct option (s) with the possible values of  n1,n2,n3and  n4 is (are)

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a

n1=8,  n2=6,n3=5,n4=20

b

n1=3,  n2=3,n3=5,n4=15

c

n1=3,  n2=6,n3=10,n4=50

d

n1=6,  n2=12,n3=5,n4=20

answer is A, B.

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Detailed Solution

 III Rn1n3n3n3+n4n1n1+n2+n3n3+n4Bn2n42n3n3+n4=n1n1+n2=13

n1n1+n2=12  ,n3n3+n4=14

n1n1+n2=13  ,n3n3+n4=16

n1n1+n2=47  ,n3n3+n4=15

n1n1+n2=13  ,n3n3+n4=15

 

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