SOLUTION: An urn contains 8 white balls and 4 red balls. In how many ways can 4 balls be drawn if a) 3 balls are white an 1 is red b) 2 balls are white and 2 are red c) all four balls are

Algebra ->  Permutations -> SOLUTION: An urn contains 8 white balls and 4 red balls. In how many ways can 4 balls be drawn if a) 3 balls are white an 1 is red b) 2 balls are white and 2 are red c) all four balls are      Log On