The series $\"\"$

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The formula for finding nth terms is $\"\"$

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Find $\"\"$ 8th term.

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$\"\"$

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Formula for sumof nth term is $\"\"$

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Substitute $\"\"$

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$\"\"$

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Sum of 8th term is $\"\"$

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2)

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The arithmetic series $\"\"$

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The formula for finding nth terms is $\"\"$

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Find $\"\"$ term.

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Rewrite the series.

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$\"\"$

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Find the sum of infinite series.

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The sum of infinite series is $\"\"$