A bag contains 7 red balls and 5 white balls. 4 balls are drawn at random. What is the probability
(ö all of them are red; (ii) two of them are red and two white ?
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Bag contains 7 red balls & 5 white balls
i) all of them are red=7c4/12c4=7/99
ii) two of them are red and two white
=7c2×5c2 /12c4= 14/33
i) all of them are red=7c4/12c4=7/99
ii) two of them are red and two white
=7c2×5c2 /12c4= 14/33
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