There are four nines in a deck of cards.
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There are four 5 and four 9 cards. Thus 8 out of 52 cards are 5 or 9.
There are four fives and four nines; so the number of cards that are a five or a nine is 4 + 4 or 8.
Four 9's
In a normal deck there are 39 such cards.
There are two red aces in a deck of cards.