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2015-11-26T18:11:24+05:30

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Term 17 = a + 16d
Term 10 = a + 9d
Given that   Term 17 - Term 10 = 7
⇒ a + 16d - (a + 9d) = 7
⇒a + 16d - a - 9d = 7
⇒7d = 7
⇒d = 7/7
∴The common difference     d = 1
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