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Solution of problem N4926 probability theory
4926. There are 20 parts in a box, of which 15 are standard. The assembler randomly takes 2 parts. Find the probability that both parts taken are standard. Solved in two ways.
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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Discount for regular customers! If the total of your purchases from the seller
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