Question

Bag contain 6 white and 5 black balls two balls are drawn at random time

Answer 1

Let white balls be W1, W2, W3, W4, W5, W6. And black balls be B1 , B2, B3, B4, B5.
Therefore,
S = { W1W2,W1W3,W1W4,W1W5,W1W6,W2W3,W2W4,W2W5,W2W6,W3W4,W3W5,W3W6,W4W5,W4W6,W5W6,
B1B2,B1B3,B1B4,B1B5,B2B3,B2B4,B2B5,B3B4,B3B5,B4B5,
W1B1,W1B2,W1B3,W1B4,W1B5,W2B1,W2B2,W2B3,W2B4,W2B5,
W3B1,W3B2,W3B3,W3B4,W3B5,
W4B1,W4B2,W4B3,W4B4,W4B5,
W5B1,W5B2,W5B3,W5B4,W5B5
W6B1,W6B2,W6B3,W6B4,W6B5}