Assignment 6 1. Prove by contradiction that: there are no integers a and b for which...
Assignment 6
1. Prove by contradiction that:
there are no integers a and b for which 18a+6b = 1.
2. Prove by contradiction that:
if a,b ∈ Z, then a2 −4b ≠ 2
3. Prove by contrapositive that:
If x and y are two integers whose product is even, then at least
one of the two must be even.
Make sure that you clearly state the contrapositive of the above statement at the beginning of your proof.
4. Prove that for all integers x, x2 + 5x - 1 is odd.
Homework Answers
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Assignment 6
1. Prove by contradiction that:
there are no integers a and b for which...
1. Consider the following claim. Claim: For two integers a and b, if a + b...
1. Consider the following claim. Claim: For two integers a and b, if a + b is odd then a is odd or b is odd. (a) If we consider the claim as the implication P =⇒ Q, which statement is P and which is Q? (b) Write the negations ¬P and ¬Q. (c) (1 point) Write the contrapositive of the claim. (d) Prove the contrapositive of the claim. 2. Use contraposition (proof by contrapositive )to prove the following claim....
please answer questions #7-13 7. Use a direct proof to show every odd integer is the...
please answer questions #7-13
7. Use a direct proof to show every odd integer is the difference of two squares. [Hint: Find the difference of squares ofk+1 and k where k is a positive integer. Prove or disprove that the products of two irrational numbers is irrational. Use proof by contraposition to show that ifx ty 22 where x and y are real numbers then x 21ory 21 8. 9. 10. Prove that if n is an integer and 3n...
Please solve the all the questions below. Thanks. Especially pay attention to 2nd question. t, which...
Please solve the all the questions below. Thanks.
Especially pay attention to 2nd question.
t, which type of proof is being used in each case to prove the theorem (A → C)? Last Line 겨 (p A -p) 겨 First Line a C b. C d. (some inference) C Construct a contrapositive proof of the following theorem. Indicate your assumptions and conclusion clearly 2. If you select three balls at random from a bag containing red balls and white balls,...
Prove by contradiction that if a, b ∈ Z, then a 2 − 4b 6= 3.
Prove by contradiction that if a, b ∈ Z, then a 2 − 4b 6= 3.
6. (20 points) Problem 2, page 91. Prove that the sum of two even integers is...
6. (20 points) Problem 2, page 91. Prove that the sum of two even integers is even. Use the three proofing techniques (a) a direct proof (b) a proof by contradiction (c) a proof by contraposition
1 point Prove the following statement: If n2 is even, then n is even. Order each of the following sentences so that the...
1 point Prove the following statement: If n2 is even, then n is even. Order each of the following sentences so that they form a logical proof. Proof by Contrapositive: Choose from these sentences: Your Proof: Suppose n is odd. Then by definitionn 2k +1 for some integer k Required to show if n is not even (odd), then n is not even (odd). Thus n2(2k1)2. n24k2 4k1. 22(22+2k) +1 Thus n2 (an integer) +1 and by definition is odd....
Indirect Proofs: Prove Problems 5 - 7 using either proof by contradiction or proof by contraposition....
Indirect Proofs: Prove Problems 5 - 7 using either proof by contradiction or proof by contraposition. AT LEAST ONE MUST USE PROOF BY CONTRADICTION! 7) For integers c, if c = ab and the ged(a,b) = 1, then a and b are perfect squares. (Hint: If a and b are not perfect squares, what type of number are they?)
Please solve all parts of the question 6. (10 points 5+5) We want to prove by...
Please solve all parts of the question
6. (10 points 5+5) We want to prove by contradiction that, for all integers k not divisible by p, if p is prime then no two different numbers in the set Ak(k,2k, 3k.. 1)k) are congruent mod p. (a) Clearly state the assumption to begin the proof by contradiction. (b) Complete the proof by making two observations regarding this assumption that immediately lead to a contradiction
(6) Use a proof by contrapositive to prove for all integers a, b and c, if...
(6) Use a proof by contrapositive to prove for all integers a, b and c, if a t be then à f 6. (7) Prove using cases that the square of any integer has the form 4k or 4k +1 for some integer k. (8) Prove by induction that 32n -1 is divisible by 8.
Use the method of direct proof to prove the following statement: For integers a and b,...
Use the method of direct proof to prove the following statement: For integers a and b, if a is odd or b is odd, then (a + 7)(b 5) is even.
please answer questions #7-13
7. Use a direct proof to show every odd integer is the difference of two squares. [Hint: Find the difference of squares ofk+1 and k where k is a positive integer. Prove or disprove that the products of two irrational numbers is irrational. Use proof by contraposition to show that ifx ty 22 where x and y are real numbers then x 21ory 21 8. 9. 10. Prove that if n is an integer and 3n...
Please solve the all the questions below. Thanks.
Especially pay attention to 2nd question.
t, which type of proof is being used in each case to prove the theorem (A → C)? Last Line 겨 (p A -p) 겨 First Line a C b. C d. (some inference) C Construct a contrapositive proof of the following theorem. Indicate your assumptions and conclusion clearly 2. If you select three balls at random from a bag containing red balls and white balls,...
6. (20 points) Problem 2, page 91. Prove that the sum of two even integers is even. Use the three proofing techniques (a) a direct proof (b) a proof by contradiction (c) a proof by contraposition
1 point Prove the following statement: If n2 is even, then n is even. Order each of the following sentences so that they form a logical proof. Proof by Contrapositive: Choose from these sentences: Your Proof: Suppose n is odd. Then by definitionn 2k +1 for some integer k Required to show if n is not even (odd), then n is not even (odd). Thus n2(2k1)2. n24k2 4k1. 22(22+2k) +1 Thus n2 (an integer) +1 and by definition is odd....
Indirect Proofs: Prove Problems 5 - 7 using either proof by contradiction or proof by contraposition. AT LEAST ONE MUST USE PROOF BY CONTRADICTION! 7) For integers c, if c = ab and the ged(a,b) = 1, then a and b are perfect squares. (Hint: If a and b are not perfect squares, what type of number are they?)
Please solve all parts of the question
6. (10 points 5+5) We want to prove by contradiction that, for all integers k not divisible by p, if p is prime then no two different numbers in the set Ak(k,2k, 3k.. 1)k) are congruent mod p. (a) Clearly state the assumption to begin the proof by contradiction. (b) Complete the proof by making two observations regarding this assumption that immediately lead to a contradiction
(6) Use a proof by contrapositive to prove for all integers a, b and c, if a t be then à f 6. (7) Prove using cases that the square of any integer has the form 4k or 4k +1 for some integer k. (8) Prove by induction that 32n -1 is divisible by 8.
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