$\"\"$

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The sequence is $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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If $\"\"$ is even, then $\"\"$ is $\"\"$ .

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If $\"\"$ is odd, then $\"\"$ is $\"\"$ .

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Observe the graph :

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Therefore, the correct choice option $\"\"$ .

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$\"\"$

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The correct choice option $\"\"$ .