I have one and it contains 50 cards. It's really good!
Depends on the Starter Deck. For example, in the Jaden Yuki starter deck their are 41 cards.
40 cards right now.
There are usually 42 cards (One whole deck and two spare cards)
There are 10 cards in a Club Penguin Card-Jitsu starter deck.
There are 52 cards in a deck of cards.
There are 52 cards in a playing deck.
There are four nines in a deck of cards.
In a normal deck there are 39 such cards.
13 diamons are in a deck of cards
In a standard deck of playing cards, there are 26 red cards.
There are two red aces in a deck of cards.
There are four 2s in a deck of cards.