Robert has 7 black pens, 5 red pens, and 12 pencils in his desk drawer. if he reaches into his desk drawer and randomly selects something to write with, what is the probability that he will grab a pen?

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Robert has 7 black pens, 5 red pens, and 12 pencils in his desk drawer. if he reaches into his desk drawer and randomly selects something to write with, what is the probability …

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