In most Poker variants, such as Texas Hold 'Em and Omaha, there are 5 shared cards, or community cards dealt. This is simply because the rules are as such.
There are other variants of poker, such as 7 Card Stud (Every player first receives 2 cards face down, 1 face up. Then they receive another 3 cards face up, each card followed by a round of betting, and a 7th card face down followed by another round of betting.) or 5 Card Draw (Every player receives 5 face down cards, followed by a round of betting. Then a player can choose to "throw cards away" and draw other cards. The ammount of cards that can be drawn is the same as the cards you threw away. So 1 card thrown away, means you can draw 1 new card. There are variants which allow up to 3 draws. In this variant there are no shared - or community - cards dealt.)
A flush in poker requires 5 cards of the same suit. Therefore, you would need 5 cards to form a flush in a standard poker hand.
Yes, a straight in poker must be made up of 5 cards in sequential order, regardless of the suit.
No, a straight in poker is a hand that consists of five cards in a sequence, regardless of the number of cards.
Yes, in poker, a sequence of cards from ace through 5 is considered a straight.
A flush in a standard poker hand requires 5 cards of the same suit.
No, in poker, a hand consists of 5 cards. Three pairs do not make a valid hand in poker.
No, a 2, 3, 4, 5 is not a straight in poker. In poker, a straight is a hand with five consecutive cards in numerical order.
I don't know what the probability of getting 5 of a kind using 106 cards is, however I do know that you cannot play poker with that many cards. Only 52 cards are ever used in poker, home games of course allow for the use of a joker in certain games.
5 Cards in a Poker Hand
Yes, poker cards and playing cards are the same thing. They are a standard deck of 52 cards used for various card games, including poker.
No
No, having 3 pairs is not a valid hand in poker. In poker, a valid hand consists of the best 5 cards out of the 7 cards available to each player. Having 3 pairs would mean having 6 cards, which is not possible in a standard poker hand.