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Quantitative Reasoning: Probability Flashcards

7 cards from real DAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A box has 3 white, 2 black, and 5 gray balls. What is the probability of drawing a black ball?

    Answer: 1/5

    There are 2 black out of 10 total, so 2/10 = 1/5.

  2. What is the probability of drawing a heart OR a spade from a standard deck?

    Answer: 1/2

    Hearts and spades make 26 of 52 cards, so 1/2.

  3. If you draw two cards without replacement, what is the probability both are aces?

    Answer: 1/221

    (4/52) × (3/51) = 12/2652 = 1/221.

  4. A jar has 5 green and 5 yellow candies. What is the probability of drawing green twice with replacement?

    Answer: 1/4

    Each draw is 1/2, so 1/2 × 1/2 = 1/4.

  5. The probability of rain is 0.4 and snow is 0.1, mutually exclusive. What is the probability of either?

    Answer: 0.5

    For mutually exclusive events, add: 0.4 + 0.1 = 0.5.

  6. A die is rolled. What is the probability of an odd number or a 6?

    Answer: 2/3

    Odds are 1,3,5 plus 6 gives 4 outcomes, so 4/6 = 2/3.

  7. If P(A) = 0.6, P(B) = 0.5, and they are independent, what is P(A and B)?

    Answer: 0.30

    For independent events, multiply: 0.6 × 0.5 = 0.30.