Hi

A card is drawn at random from a 52-card deck. 

P( the card is an ace 'or' a spade) = P(ace) + P(spade) - P(ace of spades)

P( the card is an ace 'or' a spade) = 4/52 + 13/52 - 1/52 = 16/52 = 4/13 

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