There are four 7s in a deck of 52 cards. Therefore probability of picking a 7 is 4/52 or 1/13 or 0.0769.
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There are 4 Kings in a deck of 52 cards, so the probability of picking a King is 4/52 or 1/13.
Since there are four 5's in a deck of 52 cards, the probability of picking a 5 from a deck of 52 cards is 4 in 52, or 1 in 13, or about 0.07692.
The probability of picking a diamond out of a standard deck of 52 cards is 13 in 52, or 1 in 4, or 0.25.
The probability of picking one red card of a deck of 52 playing cards is 26 out of 52, or 1 out of 2.
13/52