Let be the statement ' is even' and be the statement ' and are both even'. Which of the following is correct? (Here and are integers.)
Answer and explanation
Correct answer: D. is a necessary but not a sufficient condition for
- Step 1: If and are both even then is even, so : is necessary for .
- Step 2: But , gives an even sum without both being even, so .
Answer
is a necessary but not a sufficient condition for .
Why not the others: Two odd numbers also have an even sum, so the condition is not sufficient.
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