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When does the inverse of the statement ~pq results in T?

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Important Questions on Mathematical Reasoning

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The Boolean expression p~qq~p is equivalent to:
EASY
The contrapositive of the statement "If I reach the station in time, then I will catch the train" is
HARD
The contrapositive of the statement "If you will work, you will earn money" is:
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Write the negation of the statement a person is rich if and only if he is a software engineer.
EASY
The contrapositive of the statement "I go to school if it does not rain" is
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Write the negation of the statement if diagonals of a parallelogram are perpendicular, then it is a rhombus. 
EASY
If c denotes the contradiction then dual of the compounds statement pqc is
EASY
The contrapositive of the statement ''if I am not feeling well, then I will go to the doctor" is
EASY
The contrapositive of the following statement, "If the side of a square doubles, then its area increases four times", is
EASY

Consider the following statements:

P: Ramu is intelligent.

Q: Ramu is rich.

R: Ramu is not honest.

The negation of the statement "Ramu is intelligent and honest if and only if Ramu is not rich" can be expressed as:

EASY
The contrapositive of the statement "If it is raining, then I will not come", is
EASY
The contrapositive of the statement: "If the weather is fine then my friends will come and we will go for a picnic." is
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Negation of the statement (pr)(qr) is :
EASY
The negation of the statement : "Getting above 95% marks is necessary condition for Hema to get the admission in good college".
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If p and q are true and r and s are false statements, then which of the following is true?
EASY
If pqr is False, then the truth values of p, q, r are respectively, (where T is True and F is False)
EASY
Let A,B,C and D be four non-empty sets. The contrapositive statement of “If AB and BD , then AC ” is
HARD
Consider the following statements:

P: Suman is brilliant

Q: Suman is rich

R: Suman is honest

The negation of the statement, "Suman is brilliant and dishonest if and only if Suman is rich" can be equivalently expressed as