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Question

Write the contrapositive and converse of the following statements.

i) If x is a prime number, then x is odd.

ii) If the two lines are parallel, then they do not intersect in the same plane.

iii) Something is cold implies that it has low temperature.

iv) You cannot comprehend geometry if you do not know how to reason deductively.

v) x is an even number implies that x is divisible by 4.


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Solution

Given statement:
i) If x is a prime number, then x is odd.

Contrapositive sentence: If a number x is not odd, then it is not a prime number.

Converse sentence: If a number x is odd, then x is a prime number.

ii) Given statement:
If the two lines are parallel, then they do not intersect in the same plane.

Contrapositive sentence: If two lines intersect in the same plane, then they are not parallel.

Converse sentence: If two lines do not intersect in the same plane, then they are parallel

iii) Given statement:
Something is cold implies that it has low temperature.

Contrapositive sentence: If something does not have low temperature, then it is not cold.

Converse sentence: If something is at low temperature, then it is cold.

iv) Given statement:
You cannot comprehend geometry if you do not know how to reason deductively.

Contrapositive sentence: If you know how to reason deductively, then you can comprehend geometry.

Converse sentence: If you do not know how to reason deductively, then you cannot comprehend geometry.

v) Given statement:
x is an even number implies that x is divisible by 4.

Contrapositive sentence: If x is not divisible by 4, then x is not an even number.
Converse sentence: If x is divisible by 4 then x is an even number.


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