2927. There are 33 balls in an urn, 13 of them are white and 10 are red, the rest are green. Three balls are taken out of it at random. Determine which composition of balls by color is most likely to be extracted: a) two white balls, one green; b) all three balls of different colors.

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