it is 13/52 because there are always 4 different card colours in each deck so divide 4 in 52 and your answer is 13
hope you understand my equation
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Hope you don't because it is incorrect! The probability of any event is a number in the range [0, 1] so the answer cannot be 13!
A normal deck two coulours, not 4: red and black. It therefore contains 26 red cards and so the probability is 26/52 = 1/2.
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It is 1/4.
The probability that a random card picked from a standard pack is a Jack is 1/13.
The answer depends on how many cards are picked, whether they are picked at random, from what sort of pack, and whether or not cards are replaced before the next one is picked. The probability that a single card, picked at random from a regular 52 card deck is red, is 0.5
13/52 = .25
In a full deck of 52 cards your chances are one in thirteen. The same goes for every other card as well not just jacks.