What is the probability of selecting either a spade or a king from a standard, well-shuffled deck of cards?

Explanation

To find the probability of drawing a spade or a king, use the formula P(S ∪ K) = P(S) + P(K) - P(S ∩ K). There are 13 spades and 4 kings in the deck, but one card (the king of spades) is counted twice, so subtract it once. Therefore, P(S ∪ K) = 13/52 + 4/52 - 1/52 = 16/52 = 4/13.