Let be the statement '' and be the statement ' for every real '. Which of the following is correct? (Here is a real number.)
Answer and explanation
Correct answer: C. is both a necessary and a sufficient condition for
- Step 1: has least value (at ).
- Step 2: So for all exactly when , i.e. : the statements are equivalent.
Answer
is both a necessary and a sufficient condition for .
Why not the others: There is no for which exactly one of the two statements holds, because both are equivalent to .
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