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There are two black jacks in each deck of cards. There is a jack of spades and a jack of clubs. Each deck of cards has two suits that are black, spades and clubs. Each deck also has three face cards (cards that depict a person), jack, queen and king, for each suit. Therefore, there are two black jacks (jack of a black suit) in each deck of 52 cards.
There are 52 cards in a pack of playing cards (excluding jokers). The chance of drawing at random a black card from a full pack of cards is 1/2, or 0.5. There are now 51 cards in the pack, two of which are red kings. The probability of drawing a red king from this pack is 2/51. 0.5 x 2/51 = 0.01960784 So, the probability is approximately 0.0196, or 1.96%.
In a standard deck of 52 playing cards, there are two black 8s: the 8 of spades and the 8 of clubs. Each suit contains one card of each rank, and since there are two black suits (spades and clubs), there are two black 8s in total.
In a normal poker deck, a total of 26 cards are red. This is half of the cards (two out of the four suits).
Form a normal pack of 52 cards (no Jokers), it is 2/13 or approx 0.154