$\"\"$

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$\"\"$ term is $\"\"$ and $\"\"$ term is $\"\"$ .

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The formula for $\"\"$ term: $\"\"$ .

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$\"\"$ term is $\"\"$ : $\"\"$ .

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$\"\"$ term is $\"\"$ : $\"\"$ .

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Subtract the equation $\"\"$ from $\"\"$ .

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$\"\"$

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$\"\"$

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Common difference is $\"\"$ .

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$\"\"$

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Substitute $\"\"$ in equation $\"\"$ .

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$\"\"$ .

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$\"\"$

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First term of the sequence is $\"\"$ .

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The recursive formula is $\"\"$ .

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$\"\"$ .

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The formula for $\"\"$ term: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Common difference is $\"\"$ .

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First term of the sequence is $\"\"$ .

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Recursive formula: $\"\"$ .

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$\"\"$ term formula: $\"\"$ .