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What is the method of mathematical proofs by contradiction? 

Important Questions on Proof of Mathematical Statements

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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
Prove that the sum of three successive even integers is always a multiple of 6.
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The sum of two odd numbers is always _____.
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements

Prove that the sum of three consecutive even numbers is always a multiple of 6.

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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement ''72 is divisible by 2 and 3'' is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
Prove that 6n + 13  is an odd integer, where n is an integer.
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement "For all real numbers x and y,x+y=y+x" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The contrapositive of the statement "If she works, she will earn money" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement: "The product of 3 and 4 is 9" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
Which of the following is the contrapositive of the statement “If the two lines are parallel, then they do not intersect in the same plane”.
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The Contrapositive of the statement p∨q→r is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The contrapositive of the statement: "If 7 is greater than 5, then 8 is greater than 6" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
Which of the following statement is true?
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The contrapositive statement of the statement, "If the two lines are parallel, then they do not intersect in the same plane" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The contrapositive of the statement: "if roses are red, then violets are blue" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The contrapositive statement of "If she works, she will earn money" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
Identify the contrapositive of statement “If Chandigarh is capital of Punjab, then Chandigarh is in India”.
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement "A circle is an ellipse" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement "Sum of 3 and 4 is equal to 9" is
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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements

Consider the statement p : "New Delhi is a city". Which of the following is not the negation of p?

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Mathematics>Algebra>Proof of Mathematical Statements>Mathematical Statements
The negation of the statement "(2+3) is a complex number" is