\"\"

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In the arithmetic sequence \"\", \"\" and \"\".

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Apply nth term of an arithmetic sequence formula: \"\".

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\"\"           (Substitute \"\", \"\" and \"\")

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\"\"                 (Subtract: \"\")

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

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\"\"                            (Add: 20 + 320 = 340)\"\"

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The indicated term of arithmetic sequence is \"\".