Let be the statement ' is an integer' and be the statement ' is an integer'. Which of the following is correct? (Here is a real number.)

Answer and explanation

Correct answer: C. is a sufficient but not a necessary condition for

  1. Step 1: If is an integer then is an integer, so .
  2. Step 2: But has , an integer, while is not an integer, so .
Answer
is a sufficient but not a necessary condition for .
Why not the others: is sufficient but the value shows it is not necessary.

Practise more Necessary and sufficient conditions.

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