Mathematics, 15.10.2019 12:10 PoTubbs

Acup on the teachers desk contains 12 pens. there are 3 pens with blue ink and 9 with black ink. one student at a time selects a pen at random to sign the attendance sheet and then puts the pen back in the cup. what is the probability that the first three students all randomly select a pen with blue ink?

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Acup on the teachers desk contains 12 pens. there are 3 pens with blue ink and 9 with black ink. one...