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The question asks for the probability that Aaron selects a retriever, given that Rebecka selects a retriever, without replacement. Let's break down the problem step by step:

### Given:
- There are 8 puppies: 2 poodles, 5 terriers, and 1 retriever.
- Rebecka and Aaron each select one puppy at random, without replacement.
- We need to find the probability that **Aaron selects the retriever** given that **Rebecka selects the retriever**.

### Solution:
1. **Total number of puppies**: 8 puppies (2 poodles, 5 terriers, 1 retriever).
   
2. **Conditional Probability**: We are asked to find the probability that Aaron selects the retriever given that Rebecka has already selected the retriever. This is a conditional probability problem.

   - If Rebecka selects the retriever, then there are **7 puppies left**, but no retriever remains for Aaron to select.
   
   - Therefore, the probability that Aaron selects the retriever after Rebecka already selected it is **0** (because there is no retriever left for Aaron to choose from).

### Final Answer: 
The probability is **0**.

Would you like more details or have any questions?

Here are some related questions:
1. What is the probability that Rebecka selects a terrier?
2. What is the probability that Rebecka selects a poodle and Aaron selects a terrier?
3. How does the probability change if there were 2 retrievers instead of 1?
4. What is the general formula for conditional probability?
5. How does "without replacement" affect the probabilities compared to "with replacement"?

**Tip:** When solving probability problems, always consider whether the events are independent or dependent, and if you're dealing with conditional probability, be clear about what conditions are affecting the outcome.

A pet store has 8 puppies, including 2 poodles, 5 terriers, and 1 retriever. Rebecka and Aaron, in that order, each select one puppy at random without replacement. Find the probability that Aaron selects a retriever, given Rebecka selects a retriever.

Solve the conditional probability problem involving 8 puppies (2 poodles, 5 terriers, 1 retriever), where Rebecka selects first, followed by Aaron, without replacement. Learn how to calculate the probability that Aaron selects a retriever given that Rebecka already selected the retriever.

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