Let be the statement '' and be the statement ''. Which of the following is correct? (Here and are real numbers.)
Answer and explanation
Correct answer: A. is neither a necessary nor a sufficient condition for
- Step 1: , : but . So .
- Step 2: , : but . So .
Answer
is neither a necessary nor a sufficient condition for .
Why not the others: Each direction has its own counterexample, so neither condition is necessary nor sufficient.
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