Answer :

Let us assume R be the event of drawing the red marbles

Let us also assume E_{A}, E_{B} andE_{C} denote the boxes A, B and C respectively

It is given in the question that,

Total number of marbles = 40

Also, total number of red marbles = 15

∴

Probability of taking out the red marble from box A,

Also, probability of taking out the red marble from box B,

And, Probability of taking out the red marble from box C,

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