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Suppose we have four boxes. A, B, C and D containing coloured marbles as given below:

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asked Jan 27, 2018 in Mathematics by sforrest072 (157,439 points) ● 61 ● 411 ● 949
edited Mar 7, 2018 by faiz

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?

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answered Jan 27, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 15
edited Mar 7, 2018 by faiz
 
Best answer

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

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