Question 1156973
Clearly, 2 red kings out of 26 red cards, so (2/26) = {{{ highlight(1/13)}}}

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However, if you want to apply Bayes to solve (just to illustrate):

P(A)*P(B|A) = P(B)*P(A|B)<br>

and 
P(A) = probability of king drawn = 4/52 = 1/13
P(B) = probability of a red card drawn = 26/52 = 1/2
P(B|A) = probability of a red card given it is a king = 1/2 (2 red kings / 4 kings total)<br>
P(A|B) = P(A)*P(B|A) / P(B) = (1/2)(1/13) / (1/2) = 1/13, as above