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A card is drawn from an ordinary pack of...

A card is drawn from an ordinary pack of 52 cards and a gambler bets that, it is a spade or an ace. What are the odds against his wining this bet?

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Number of cards which are spade or ace = 13 + 4 - 1 = 16
So, probability of the card being a spade or an ace = `(16)/(52) = (4)/(13)`
Hence, odds in favour is 4 : 9.
Therefore, odds against him of winning the best is 9 : 4.
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