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Students complete a worksheet on conditional statements, identifying truth values and classifying statements as conditional, converse, contrapositive, or bi-conditional.

Handwritten math worksheet with conditional statements and truth values, including examples about natural numbers and library cards.

Handwritten math worksheet with conditional statements and truth values, including examples about natural numbers and library cards.

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Show Answer Key & Explanations Step-by-step solution for: SOLUTION: Unit 2 Logic and Proof Conditional Statements Worksheet ...
It looks like you've uploaded a worksheet involving logic and conditional statements. The text is somewhat blurry, but I can help interpret and solve the problems based on what’s visible.

Let me break it down into two main sections:

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Section 1: Conditional Statements and Truth Values



This section involves understanding logical implications related to rational and whole numbers.

Given Statement:
> If a number is a rational number, then it is also a whole number.

We are asked to analyze:
- Converse
- Inverse
- Contrapositive
- Biconditional

Let’s define:
- $ p $: A number is a rational number.
- $ q $: A number is a whole number.

Original statement: $ p \rightarrow q $

Now let's analyze each:

#### 1. Converse: $ q \rightarrow p $
> If a number is a whole number, then it is a rational number.

- Truth Value: True
- All whole numbers (0, 1, 2, ...) are rational because they can be written as fractions: e.g., $ 2 = \frac{2}{1} $.

#### 2. Inverse: $ \neg p \rightarrow \neg q $
> If a number is not a rational number, then it is not a whole number.

- Truth Value: True
- This is logically equivalent to the contrapositive of the original (but note: the original is false, so we must check carefully).
- However, since the original statement is false, we need to assess this.
- But actually, the inverse is logically equivalent to the converse.
- Since the converse is true, and the inverse has the same truth value as the converse in classical logic? Wait — no: inverse is NOT equivalent to converse.
- Let’s think: If a number is not rational → not whole.
- Suppose a number is irrational (e.g., √2). Then it is not a whole number → True.
- So: if not rational → not whole → True.
- So the inverse is true.

But wait — the original statement "If rational → whole" is false, because there are rational numbers that are not whole numbers (e.g., $ \frac{1}{2} $).

So let’s correct:

- Original: $ p \rightarrow q $: False (because $ \frac{1}{2} $ is rational but not whole)
- Converse: $ q \rightarrow p $: True (whole ⇒ rational)
- Inverse: $ \neg p \rightarrow \neg q $: True (not rational ⇒ not whole) — yes, because all irrationals are not whole numbers.
- Contrapositive: $ \neg q \rightarrow \neg p $: False — because not whole ⇒ not rational?
- Example: $ \frac{1}{2} $ is not whole, but it is rational → So $ \neg q $ is true, $ \neg p $ is false → implication fails → False
- Biconditional: $ p \leftrightarrow q $: False — because the two directions don’t match.

But looking at your image, the truth values seem to have been filled in. Let’s see what you wrote:

You have:
- Converse: True
- Inverse: True
- Contrapositive: True ← This is likely incorrect
- Biconditional: True ← Also incorrect

Wait — the contrapositive of $ p \rightarrow q $ is $ \neg q \rightarrow \neg p $

- $ \neg q $: Not a whole number
- $ \neg p $: Not a rational number

So: If a number is not a whole number → then it is not rational?

But $ \frac{1}{2} $ is not a whole number, yet it is rational → So the implication fails → False

So contrapositive is False, not True.

And biconditional: $ p \leftrightarrow q $: only true if both directions are true → but original is false, converse is true → so overall False

So corrections:
- Original: False
- Converse: True
- Inverse: True
- Contrapositive: False
- Biconditional: False

But perhaps the original was meant to be "If a number is a whole number, then it is rational" — which would make more sense.

But as written: “If a number is rational, then it is whole” — this is false.

So the truth values should be:
- Converse: True
- Inverse: True
- Contrapositive: False
- Biconditional: False

But your image says:
- Contrapositive: True ← Incorrect
- Biconditional: True ← Incorrect

So likely a mistake in the answers.

---

Section 2: Logical Statements with p and q



Let:
- $ p $: You have a library card
- $ q $: You can check out books

We are given several logical forms and need to write the English sentence and classify it.

#### 4. $ p \rightarrow q $
> If you have a library card, then you can check out books.

- Classify: Conditional

Correct.

#### 5. $ \neg q \rightarrow \neg p $
> If you cannot check out books, then you do not have a library card.

- This is the contrapositive of $ p \rightarrow q $
- Contrapositive is logically equivalent to the original.
- So: Contrapositive

Correct.

#### 6. $ q \rightarrow p $
> If you can check out books, then you have a library card.

- This is the converse of $ p \rightarrow q $
- Converse

Correct.

#### 7. $ \neg p \rightarrow \neg q $
> If you don't have a library card, then you cannot check out books.

- This is the inverse of $ p \rightarrow q $
- Inverse

Correct.

#### 8. $ p \leftrightarrow q $
> If you have a library card, then you can check out books, and if you can check out books, then you have a library card.

- This is the biconditional
- Biconditional

Correct.

---

Final Answers Summary



#### Section 1: Rational & Whole Numbers

Let’s assume the original statement is:
> If a number is rational, then it is a whole number. → False

Then:

| Form | Statement | Truth Value |
|------------------|---------------------------------------------------------------------------|-------------|
| Original | If rational → whole | False |
| Converse | If whole → rational | True |
| Inverse | If not rational → not whole | True |
| Contrapositive | If not whole → not rational | False |
| Biconditional | Rational ↔ whole | False |

> ⚠️ Note: Your handwritten answers say "True" for contrapositive and biconditional — these are incorrect.

---

#### Section 2: Library Card Logic

| Symbolic | Statement | Type |
|---------|---------------------------------------------------------------------------|----------------|
| 4. $ p \rightarrow q $ | If you have a library card, then you can check out books. | Conditional |
| 5. $ \neg q \rightarrow \neg p $ | If you cannot check out books, then you do not have a library card. | Contrapositive |
| 6. $ q \rightarrow p $ | If you can check out books, then you have a library card. | Converse |
| 7. $ \neg p \rightarrow \neg q $ | If you don't have a library card, then you cannot check out books. | Inverse |
| 8. $ p \leftrightarrow q $ | If you have a library card, then you can check out books, and vice versa. | Biconditional |

All classifications are correct.

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🔍 Final Notes



- The truth values in Section 1 need correction.
- The logical forms in Section 2 are correctly identified.

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