Math
posted by Glare .
A card is drawn from an ordinary pack of playing cards and a person bets that it is a spade or a king.What are odds against his winning this bet?

P(spade) = 1/4
P(king) = 1/13
P(spade v king) = P(spade) + P(king)  P(spade ^ king)
= 1/4 + 1/13  1/4 * 1/13
= (13+41)/(4*13)
= 16/52
= 4/13
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