$\"\"$ \ \

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The series is $\"\"$ . \ \

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(a) Find the value of $\"\"$ .

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Expand the series $\"\"$ .

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$\"\"$

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In the series $\"\"$ the value of the $\"\"$ starts from $\"\"$ to $\"\"$ .

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In the series $\"\"$ the value of the $\"\"$ starts from $\"\"$ to $\"\"$ .

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For find the value of $\"\"$ , subtract the value for $\"\"$ term from $\"\"$ .

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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(b) Find the value of $\"\"$ .

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The series is $\"\"$ .

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The $\"\"$ th the term is the next term of the $\"\"$ th term.

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For find the value of $\"\"$ , the limit value is increased by $\"\"$ .

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Hence, $\"\"$ .

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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(c) Find the value of $\"\"$ .

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The series is $\"\"$ .

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Rewrite the series.

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$\"\"$

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$ .

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Therefore, $\"\"$ .

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ .

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(c) $\"\"$ .