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The difference between 12th and 8th term of an arithmetic sequence is 20. Find the common difference. |
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Answer» 12th term = f + 11d 8th term = f + 7d Difference = f + 11d - (f + 7d) = 20 That is, 4d = 20, d = \(\frac{20}{4}=5\) Common difference (d) = 5 |
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