Math to Stats Pathway (Blended) - Exam II Chapter 3
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This document provides solutions for the exam II chapter 3 of Math to Stats Pathway (Blended) course. It includes symbolic statements, compound statements, negation of quantified statements, truth tables, and equivalence of statements.
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MGF 1106Math to Stats Pathway (Blended)
MDC Spring 2019
Exam II Chapter 3
Prof. Charles
NAME: __________________ DATE: ____________
SCORE: _____________
MDC Spring 2019
Exam II Chapter 3
Prof. Charles
NAME: __________________ DATE: ____________
SCORE: _____________
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Let p, q, and r represent the following simple statements:
p: Iβm registered.
q: Iβm a citizen.
r: I vote.
Write each of the symbolic statements in words:
1.
Sol.
Since, I am registered and I am a citizen, therefore, I vote.
2.
Sol.
If do not vote then either I am not registered or I am not a citizen.
Write each compound statement in symbolic form.
3. I am registered and a citizen, or I do not vote.
Sol.
π β© π βͺ ~π
4. If I am not registered or not a citizen, then I do not vote.
Sol.
(π~ βͺ ~π) β ~π
Write the negation of each quantified statement. (The negation should begin with βall,β
βsome,β or βno.β)
5. All numbers are divisible by 5.
Sol.
No numbers are divisible by 5.
6. Some people wear glasses.
Sol.
Some people do not wear glasses.
7. Not all dogs are playful.
Sol.
p: Iβm registered.
q: Iβm a citizen.
r: I vote.
Write each of the symbolic statements in words:
1.
Sol.
Since, I am registered and I am a citizen, therefore, I vote.
2.
Sol.
If do not vote then either I am not registered or I am not a citizen.
Write each compound statement in symbolic form.
3. I am registered and a citizen, or I do not vote.
Sol.
π β© π βͺ ~π
4. If I am not registered or not a citizen, then I do not vote.
Sol.
(π~ βͺ ~π) β ~π
Write the negation of each quantified statement. (The negation should begin with βall,β
βsome,β or βno.β)
5. All numbers are divisible by 5.
Sol.
No numbers are divisible by 5.
6. Some people wear glasses.
Sol.
Some people do not wear glasses.
7. Not all dogs are playful.
Sol.
All dogs are playful.
Construct a truth table for the statement.
8.
Sol.
p q ~π π βͺ ~π ~(~π βͺ ~π)
0 0 1 1 0
0 1 0 1 0
1 0 1 1 0
1 1 0 1 0
Construct a truth table for the given statement. Use the truth table to determine whether
the statement is a tautology.
9.
Sol.
p q r ~π π β¨ π βΌ (π
β¨ π)
βΌ π β§ π βΌ (π
β¨ π) β
βΌ π β§ π
0 0 0 1 0 1 0 0
0 0 1 1 1 0 1 1
0 1 0 0 0 1 0 0
0 1 1 0 1 0 0 1
1 0 0 1 1 0 0 1
1 0 1 1 1 0 1 1
1 1 0 0 1 0 0 1
1 1 1 0 1 0 0 1
From the truth table, we can see that this statement is not a tautology.
Construct a truth table for the statement.
8.
Sol.
p q ~π π βͺ ~π ~(~π βͺ ~π)
0 0 1 1 0
0 1 0 1 0
1 0 1 1 0
1 1 0 1 0
Construct a truth table for the given statement. Use the truth table to determine whether
the statement is a tautology.
9.
Sol.
p q r ~π π β¨ π βΌ (π
β¨ π)
βΌ π β§ π βΌ (π
β¨ π) β
βΌ π β§ π
0 0 0 1 0 1 0 0
0 0 1 1 1 0 1 1
0 1 0 0 0 1 0 0
0 1 1 0 1 0 0 1
1 0 0 1 1 0 0 1
1 0 1 1 1 0 1 1
1 1 0 0 1 0 0 1
1 1 1 0 1 0 0 1
From the truth table, we can see that this statement is not a tautology.
Use the truth table to determine whether the two statements are equivalent.
10. ~p q, q p
Sol.
p q ~π ~π β π π β ~π
0 0 1 0 1
0 1 1 1 1
1 0 0 1 1
1 1 0 1 1
From the above table, we can conclude that the above two statements are not equivalent to each
other.
11. Write the inverse, converse, and the contrapositive of: if it is August, it does not
snow.
a) Inverse
Sol.
If it is not August, it snows.
b) Converse
Sol.
If it does not rain, then it is August.
c) Contrapositive
Sol.
If it snows, then it is not August.
d) Negation
Sol.
It is August and it snows.
10. ~p q, q p
Sol.
p q ~π ~π β π π β ~π
0 0 1 0 1
0 1 1 1 1
1 0 0 1 1
1 1 0 1 1
From the above table, we can conclude that the above two statements are not equivalent to each
other.
11. Write the inverse, converse, and the contrapositive of: if it is August, it does not
snow.
a) Inverse
Sol.
If it is not August, it snows.
b) Converse
Sol.
If it does not rain, then it is August.
c) Contrapositive
Sol.
If it snows, then it is not August.
d) Negation
Sol.
It is August and it snows.
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determine whether each argument in problem 11-14 is valid or invalid.
12. If a parrot talks, it is intelligent.
This parrot is intelligent.
Sol.
π: π΄ ππππππ‘ π‘ππππ
π: ππππππ‘ ππ πππ‘ππππππππ‘
π: πΌπ π ππππππ‘ π‘ππππ , ππ‘ ππ πππ‘ππππππππ‘ = π β π
π: πβππ ππππππ‘ ππ πππ‘ππππππππ‘, π‘βπππππππ ππππππ‘ π‘ππππ = π β π
p q π = π β π π = π β π
0 0 1 1
0 1 1 0
1 0 0 1
1 1 1 1
We can say that for all cases when S is true, T is not true. Therefore, it is not a valid
statement.
13. I am sick or I am tired.
I am not tired.
Sol.
π: πΌ ππ π πππ
π: πΌ ππ π‘ππππ
π: πΌ ππ π πππ ππ πΌ ππ π‘ππππ = π βͺ π
π: πΌ ππ πππ‘ π‘ππππ, π‘βπππππππ, π ππ π πππ = ~π β π
p q ~π π = π βͺ π π = ~π β π
0 0 1 0 0
0 1 0 1 1
1 0 1 1 1
1 1 0 1 0
We can say that for all cases when S is true, T is not true. Therefore, it is not a valid
statement.
14. All rabbis are Jewish.
Sol.
π: π΄ππ ππππππ πππ π½ππ€ππ β
π: ππππ π½ππ€π πππ πππ£π πππ βππ ππππ‘πππ¦ π‘πππππ‘ππππ
π: ππππ ππππππ πππ πππ£π πππ βππ ππππ‘πππ¦ π‘πππππ‘ππππ
12. If a parrot talks, it is intelligent.
This parrot is intelligent.
Sol.
π: π΄ ππππππ‘ π‘ππππ
π: ππππππ‘ ππ πππ‘ππππππππ‘
π: πΌπ π ππππππ‘ π‘ππππ , ππ‘ ππ πππ‘ππππππππ‘ = π β π
π: πβππ ππππππ‘ ππ πππ‘ππππππππ‘, π‘βπππππππ ππππππ‘ π‘ππππ = π β π
p q π = π β π π = π β π
0 0 1 1
0 1 1 0
1 0 0 1
1 1 1 1
We can say that for all cases when S is true, T is not true. Therefore, it is not a valid
statement.
13. I am sick or I am tired.
I am not tired.
Sol.
π: πΌ ππ π πππ
π: πΌ ππ π‘ππππ
π: πΌ ππ π πππ ππ πΌ ππ π‘ππππ = π βͺ π
π: πΌ ππ πππ‘ π‘ππππ, π‘βπππππππ, π ππ π πππ = ~π β π
p q ~π π = π βͺ π π = ~π β π
0 0 1 0 0
0 1 0 1 1
1 0 1 1 1
1 1 0 1 0
We can say that for all cases when S is true, T is not true. Therefore, it is not a valid
statement.
14. All rabbis are Jewish.
Sol.
π: π΄ππ ππππππ πππ π½ππ€ππ β
π: ππππ π½ππ€π πππ πππ£π πππ βππ ππππ‘πππ¦ π‘πππππ‘ππππ
π: ππππ ππππππ πππ πππ£π πππ βππ ππππ‘πππ¦ π‘πππππ‘ππππ
Since it is given that p and q are always true, that All rabbis are Jewish and Some Jews observe
kosher dietary traditions. Hence this statement is also true that Some rabbis observe kosher
dietary traditions.
kosher dietary traditions. Hence this statement is also true that Some rabbis observe kosher
dietary traditions.
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