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Let n(1)and n(2) be the number of red an...

Let `n_(1)and n_(2)` be the number of red and black balls, respectively, in box I. Let `n_(3) and n_(4)` be the numbers of red and black balls, respectively, in the box II.
One of the two boxes, box I and II, was selected at random and a ball was drawn randomly our of this box. The ball was found to be red. If the probability that this red with the possible values of `n_(1),n_(2),n_(3)and n_(4)` is (are)

A

`n_1=3,n_2=3,n_3=5, n_4=15`

B

`n_1=3,n_2=6,n_3=10, n_4=50`

C

`n_1=8,n_2=6,n_3=5,n_4=20`

D

`n_1=6,n_2=12,n_3=5,n_4=20`

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The correct Answer is:
B
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