Lucia has 50 sports cards. She has 20 football cards, 10 baseball cards, 15 basketball cards and 5 hockey cards. A single card is selected at random. What is the probability that the card is a football card or a basketball card?
John rolls a pair of six-sided number cubes.
What is the probability that the sum of the numbers on the number cubes is either a multiple of 3 or an odd number?
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