A box contains 3 red pens, 4 blue pens and 5 black pens. If a pen is picked at random, what is the probability of picking a red or black pen?
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Total no. of pens= 12
no. of red pens= 3
no. of black pens= 5
total no. of red and black pens= 8
P(picking red or black pen)= 8/12
= 2/3 is the answer
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