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17 March, 18:15

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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  1. 17 March, 21:30
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    (red pens + black pens) / total pens

    (4 + 6) / 15 = 10/15 = 2/3
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