the first one is better! however, it would be even better to say "the third and final (question, point, etc) is..."
2019年5月4日
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The third and the last
2019年5月4日
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The third and last guys get a job. The rest of you, go home.
The third and the last guy get a job. The rest of you, go home.
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The third and the last samples are good.
The third and last samples are good.
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With "the" seems better on the last one.