$\"\"$

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(a)

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The series is $\"\"$ .

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Let $\"\"$ and $\"\"$ converges.

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$\"\"$ .

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$\"\"$

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The series converges.

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Therefore, If $\"\"$ and $\"\"$ converges then the series $\"\"$ converges too.

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$\"\"$ converges.

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$\"\"$

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(b)

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The series is $\"\"$ .

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Let $\"\"$ and $\"\"$ converges.

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$\"\"$ .

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$\"\"$

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The series converges.

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Therefore If $\"\"$ and $\"\"$ converges then the series $\"\"$ converges too.

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$\"\"$ converges.

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$\"\"$

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(a) The series $\"\"$ converges.

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(b) The series $\"\"$ converges.