Math Problem Statement

A pet store has 11 puppies, including 2 poodles, 5 terriers, and 4 retrievers. If Rebecka and Aaron, in that order, each select one puppy at random without replacement, find the probability that both select a poodle.

Solution

The problem in the image asks about the probability that two people (Rebecka and Aaron) each select a poodle at random without replacement from a group of 11 puppies. There are 2 poodles, 5 terriers, and 4 retrievers in the group.

To solve the problem, let's calculate the probability step by step:

  1. Total Puppies: 11 puppies in total.
  2. First Selection (Rebecka):
    • The probability that Rebecka selects a poodle is the ratio of poodles to the total puppies: P(Rebecka selects poodle)=211P(\text{Rebecka selects poodle}) = \frac{2}{11}
  3. Second Selection (Aaron):
    • After Rebecka picks a poodle, only 10 puppies remain, and there is now only 1 poodle left. P(Aaron selects poodle)=110P(\text{Aaron selects poodle}) = \frac{1}{10}
  4. Combined Probability: Since both events are independent and without replacement, we multiply the probabilities: P(Both select poodle)=211×110=2110=155P(\text{Both select poodle}) = \frac{2}{11} \times \frac{1}{10} = \frac{2}{110} = \frac{1}{55}

So, the probability that both Rebecka and Aaron select a poodle is 155\frac{1}{55}.

Would you like more details or have any questions about this?

Here are five related questions you could explore:

  1. What is the probability that both Rebecka and Aaron select terriers?
  2. How does the probability change if there were 3 poodles instead of 2?
  3. What is the probability that neither of them selects a retriever?
  4. What if there were replacement—how would the probability change?
  5. What is the probability that at least one of them selects a poodle?

Tip: Always double-check if the scenario involves replacement or no replacement, as it significantly affects the probability calculation.

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Math Problem Analysis

Mathematical Concepts

Probability
Combinatorics

Formulas

Probability formula: P(A and B) = P(A) * P(B after A)

Theorems

Multiplication rule for independent events

Suitable Grade Level

Grades 10-12