The solution to the problem is as follows:
A heart or a king: P(H or K) = P(H)+P(K)-P(H and K)
There are 13 hearts out of 52 cards, so P(H) = 13/52 = 1/4
There are 4 kings out of 52 cards, so P(K) = 4/52 = 1/13
There is 1 card which is a heart and a king (the king of
hearts), so P(H and K) = 1/52, so
P(H or K) = P(H)+P(K)-P(H and K) = 1/4+1/13-1/52 =
13/52+4/52-1/52 = 16/52 = 4/13
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