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A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is white?

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Total no. of possible outcomes = 12 {5 white, 7 red}

E ⟶ event of drawing white ball.

No. of favorable outcomes = 5 {white balls are 5}

Probability, P(E) = (No. of favorable outcomes)/(Total no. of possible outcomes)

P(E) = 5/12

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