1
In a normal 52-card "Poker" deck, there is one "7 of Clubs" card. In fact, there's only one of every type except the Joker, and there are generally two Joker cards. Of course, in Pinochle deck, there aren't any sevens at all.
There is only one of each individual card in a deck. While there are 13 cards of the heart suit, and 4 cards that have a value of seven out of the entire deck, only ONE card is a seven of hearts.
2
There are 4 sevens in a deck of 52 cards.
7
There are 4 9s in a deck of 52 (one of each suit: clubs, diamond, spade and hearts)
4 7's
2
The answer depends on how many cards are drawn.
There is only one 7 of hearts in a standard deck of 52 cards. Each card in a deck is unique and appears only once, so there is only one 7 of hearts among the 52 cards.
56 usually in the box 13 clubs 13 hearts 13 spades 13 diamonds (52 cards) 2 Jokers usually two advert cards making 56 in total, this is because they are printed as a whole pack on a large sheet for example 7 x 8 cards on a sheet makes 56.
In one deck of 52 cards you will find just one six of hearts.