P: if every fourth card drawn is a spade, then 25% of the cards in a deck would be spades. if 25% of the cards in a deck are spades, then every fourth card drawn would be a spade. if every fourth card drawn isn’t a spade, then 25% of the cards in a deck aren’t spades. if 25% of the cards in a deck aren’t spades, then every fourth card drawn wouldn’t be a spade. if every fourth card drawn isn’t a spade, then 75% of the cards in a deck are spades.