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.
The answer depends on how many cards are drawn.
4 7's
In a standard deck of 52 cards, there are 13 clubs and 1 seven of hearts. The probability of drawing a club or the seven of hearts, then, is 14 in 52, or 7 in 26.
If the cards are all different then there are 13C7 = 1716 different hands.
Of the 52 cards, there are an equal number of each of the 4 suits (Clubs, Spades, Diamonds and Hearts) so there are 52/4 = 13 of each suit. In each suit there is an A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K = 13 cards Out of the 13 Diamond cards, there is only one which is a 3. So there is only one 3 of diamonds in a standard deck of 52
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.
One seven of hearts exists in a deck of 52 cards.
There are 4 9s in a deck of 52 (one of each suit: clubs, diamond, spade and hearts)
7
1
The answer depends on how many cards are drawn.
4 7's
2
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.