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Contra Positive Statements

Consider the following “if-then” statement:
If Ravi does not study, he will not pass the test.
The contra positive of this statement is:
If Ravi passes the test, then he has studied
The contra positive of p q is
                                ~ q ~ p

Example 1:
If the weather is cold, then it will snow.

If it will not snow, then the weather is not cold.

Example 2:
I will keep this job if I get a raise in salary.

If I will not keep the job, then I will not get a raise in salary.

Example 3:
If x is odd then is odd

If is not odd (even), then x is not odd (even).

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