A box contain 9 tickets numbered from I to 9 inclusive. If 3 tickets are drawn from the box one at a time, find the probability that they arc alternately either ( I ) odd, even, odd or (2) even, odd, even.
The odds in favor of A winning a game of chess aguinq B are 3 : 2. If three games are to be played, what arc the odds (a) in favor of A's winning at least two games out of the three and ( b) against A losing the first two games to B?