$\"\"$

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The given expression is $\"\"$ .

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Method 1

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Find the terms by replacing n with 1, 2, 3, 4, 5, and 6.

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Substitute n values in $\"\"$ . $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The sum of an arithmetic series $\"\"$ .

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Where $\"\"$ is the first term and $\"\"$ is the nth term.

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Method 2

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There are 6 terms, $\"\"$ and $\"\"$ .

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The sixth term of the arithmetic sequence $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Add: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The value of $\"\"$ .