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OpenStudy (anonymous):
Fred needs to print his term paper. He pulls down a box of 12 ink cartridges and recalls that 3 of them have no more ink. If he selects 4 cartridges from the box, find the probability that a) one cartridge has no ink and b) 3 cartridges have no ink.
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OpenStudy (anonymous):
I need help for the second one.
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