Assuming a full, regular deck, no jokers? There are 52 cards in such a deck, 26 red and 26 black, making the odds of drawing a red card exactly 1 in 2.
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The probability of picking one red card of a deck of 52 playing cards is 26 out of 52, or 1 out of 2.
There are 2 red jacks, so 2/52 or about .038%
Since there are 2 red tens in a 52 card deck, probability of drawing one of the 2 red tens is 2/52 or 1/26 or 0.0385.
This is a conditional probability, given the card is red, what is the chance it is a heart. Since there are 2 red hearts, the probability if 1/2
The probability is 6/52 = 3/26.