Consider the sentence . Which of the following is true?

Question

Consider the sentence   . Which of the following is true?

Answer

The sentence is valid.

Answer

The sentence is not valid. It is false under the interpretation where    ranges over the positive integers,    is "  " and    is "  ".

Answer

The sentence is not valid. It is false under the interpretation where    ranges over the positive integers,    is "  " and    is "  ".

Answer

The sentence is not valid. It is false under the interpretation where    ranges over the positive integers,    is "  " and    is "  ".

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