What is the probability of selecting an Ace card from a pack of cards? What is t

Question

What is the probability of selecting an Ace card from a pack of cards? What is the probability of selecting a red or an Ace card? What is the probability of selecting a card that is an Ace - given that it is a black card? What are the requirements for calculating these probabilities?

Explanation / Answer

P(Ace): 4 aces in the deck, 52 cards --> 4/52 or 1/13 P(Red or Ace) = P(Red) + P(Ace) - P(Red Ace) = 1/2 + 1/13 - 1/26 = 7/13 P(Ace given it's black) = 2 black aces out of 26 black cards = 1/13 Requirements: You need the number of possibilities and the number of "successes."

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