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If a single card is randomly selected from a deck of cards, what is the probability of selecting an ace or a king?

For two mutually exclusive events A and B, compute $P\left(A\cup B\right)$ if $P\left(A\right)=0.15$ and $P\left(B\right)=0.32$

A card is drawn from a standard deck of 52 cards. What is the probability that the card is a diamond or a king?