Math Problem Statement

Let two cards be dealt successively, without replacement, from a standard 52-card deck. Find the probability of the event: two queens.

Solution

To solve this problem, we need to find the probability of drawing two queens in succession without replacement from a standard deck of 52 cards.

Step-by-Step Solution:

  1. First card (drawing a queen):

    • There are 4 queens in a deck of 52 cards.
    • The probability of drawing a queen on the first draw is: P(first queen)=452=113P(\text{first queen}) = \frac{4}{52} = \frac{1}{13}
  2. Second card (drawing a queen after the first):

    • After drawing the first queen, there are now 3 queens left and only 51 cards remaining.
    • The probability of drawing a second queen is: P(second queen)=351=117P(\text{second queen}) = \frac{3}{51} = \frac{1}{17}
  3. Total probability: Since these events are dependent (without replacement), we multiply the probabilities of the two events: P(two queens)=P(first queen)×P(second queen)=113×117=1221P(\text{two queens}) = P(\text{first queen}) \times P(\text{second queen}) = \frac{1}{13} \times \frac{1}{17} = \frac{1}{221}

Thus, the probability of drawing two queens successively is 1221\frac{1}{221}.

Would you like more details or further clarification?


Here are 5 related questions to think about:

  1. What is the probability of drawing two aces successively from a deck of 52 cards?
  2. How would the probability change if the cards were drawn with replacement?
  3. What is the probability of drawing a queen and then a king successively?
  4. What is the probability of drawing no face cards (king, queen, jack) in two draws?
  5. How does the probability change if you are drawing 3 queens instead of 2?

Tip: In probability problems involving "without replacement," remember to adjust both the number of favorable outcomes and the total outcomes after each draw.

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Math Problem Analysis

Mathematical Concepts

Probability
Combinatorics
Dependent Events

Formulas

P(first queen) = 4/52 = 1/13
P(second queen after first) = 3/51 = 1/17
P(two queens) = P(first queen) * P(second queen) = 1/13 * 1/17 = 1/221

Theorems

Probability of Dependent Events
Multiplication Rule for Probability

Suitable Grade Level

Grades 9-12