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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 A?, box B?, box C?
Asked by Jewel Last Modified
Answer 
Nurullmobeen
Let R be the event of drawing the red marble.
Let EA, EB, and EC respectively denote the events of selecting the box A, B, and C.
Total number of marbles = 40
Number of red marbles = 15
Probability of drawing the red marble from box A is given by P (EA|R).
Probability that the red marble is from box B is P (EB|R).
Probability that the red marble is from box C is P (EC|R).
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