Quality control in a group of 20 ballpoint pens on a shelf


Question: QUALITY CONTROL In a group of 20 ballpoint pens on a shelf in the stationery department of Metro Department Store, 2 are known to be defective. If a customer selects 3 of these pens, what is the probability that

a. At least 1 is defective?

b. No more than 1 is defective?

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Mathematics: Quality control in a group of 20 ballpoint pens on a shelf
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