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Which of the following statement is contradiction?

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Important Questions on Mathematical Reasoning

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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 1>Q 41
The converse of the statement, "If x is a complex number, then x is a negative number" is
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 1>Q 42
If Ram secures 100 marks in maths, then he will get a mobile. The converse is
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 1>Q 43
The statement ~(p∧q)∨q
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 1>Q 44
Negation of the statement p∧r→r∨q is
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 2>Q 1
Using quantifiers ∀, ∃, convert the following open statement into true statement. x'+5=8, x∈N' 
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 2>Q 2
Using quantifier the open sentence x2'-4=32' defined on W is converted into true statement as
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 2>Q 3
If p, q are true and r is false statement then which of the following is true statement? 
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Mathematics Crash Course JEE Main>Chapter 18 - Mathematical Reasoning>Level 2>Q 4
If A≡{4, 5, 7, 9}, determine which of the following quantified statement is true.