# Q. 12.     Suppose we have four boxes A,B,C and D containing coloured marbles as given below:One of the boxes has been selected at random and a single marble is drawn from it. If the marble is red, what is the probability that it was drawn from  box B?

Let R be event of drawing red marble.

Let   respectivly denote event of selecting box A,B,C.

Total marbles = 40

Red marbles =15

Probability of drawing red marble from box B  is

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