\"\"

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The arithmetic sequence is \"\".

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Find the common difference by subtracting successive terms.

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\"\"

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The common difference is 7.

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Add 7 to last term of the sequence to get the next termin the sequence.

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Continue adding 7 untill the next three terms are found.

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28 + 7 = 35, 35 + 7 = 42 and 42 + 7 = 49.\"\"

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The next three terms are 35, 42, 49.