Which of the following is not a valid description of the expression 3\mathb...

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Which of the following is not a valid description of the expression 3\mathbb{Z}?

The set of all integers x for which there exists another integer y such that x = 3y.

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The set of all integers x for which there exists another integer y such that y = 3x.

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The set of all integers x such that 3 \mid x.

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The set of all multiples of 3.

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