A box contains 20 marbles, 12 out of which 8 are red and 12 are green. Find the
fraction of red marbles.
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The probability of getting one red marble out of a bag containing total 20 marbles of which 8 are red = 8/20 = 2/5
Therefore probability of not getting a red marble = 1 - 2/5 = 3/5 = 60%.
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