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17-07-2016
Mathematics

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Marthy has exactly five blue pens,six black pens,and four red pens in his knapsack. if he pulls out one pen at random from his knapsack.what is the probability that the pen is either red or black?

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texaschic101 texaschic101

17-07-2016

(red pens + black pens) / total pens
(4 + 6) / 15 = 10/15 = 2/3

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