Solution of problem N3293 probability theory

Solution of problem N3293 probability theory

3293. In an urn there are 12 white, 5 red and 3 black balls. Three balls are taken at random. Find the probability that
a) all the balls will be red?
b) at least one ball will be black?
c) two balls will be white?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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