$\"\"$

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The sequence is $\"\"$ .

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The first term is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The n^th terms is $\"\"$ .

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The (n $\"\"$ 1)th terms is $\"\"$ .

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Then difference d = $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The value of difference $\"\"$ .

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First four terms are $\"\"$ .