3019. The urn contains 4 black and 7 white balls. Rando

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3019. The urn contains 4 black and 7 white balls. Randomly take out 4 balls. Find the probability that among them there is:
a) 2 white balls;
b) less than 2 white balls;
c) at least one white ball.

Additional information

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

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