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30 September, 01:35

A bag contains 5 red balls, 3 black balls and 4 white balls. A ball is drawn out at random. What is the probability that the ball

drawn is red or white or black?

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  1. 30 September, 03:36
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    Step-by-step explanation:

    Probability of drawing a black ball is:

    3 / 12 = 0.25

    Probability of drawing a red ball is:

    5/12 = [total number of red balls / total number of balls]

    Probability of drawing a white ball is:

    4/12 = 1/3 [total number of white balls / total number of balls]

    In probability, 'or' means 'sum'

    So we sum them all;

    We get: 5/12 + 3/12 + 4/12 = 1
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