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Question

Find the probability of drawing an ace or spade or both from a deck of cards.

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Solution

Event of drawing spade or an ace from a deck of 52 card are not mutually event So probability of drawing an ace or spade =P(spadeace)=P(spade)+P(ace)-P(spadeace)P(spade)=number of spade in a decktotal number of card=1352P(ace)=number of ace in a decktotal number of card=452P(acespade)=number of card in a deck which is ace and spadetotal number of card=152So P(spadeace)=P(spade)+P(ace)-P(spadeace) =1352+452-152=1652

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