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28-07-2017
Mathematics

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The third term of an arithmetic sequence is 21, and the eighth term is 56. The first term is _____.

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lgodbout23otm0my lgodbout23otm0my

28-07-2017

The first term is 7. This is because the sequence has a pattern of increasing by 7. If the first term was 7, the second would be 14, the third would be 21. The 4th would be 28, continue to the 8th term 56.

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