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s0AP in21 |
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Answer» For an AP nth term isan = a + (n-1)d Where, a = first term and d = common difference Given,a21 - a7 = 84(a + 20d) - (a + 6d) = 8420d - 6d = 8414d = 84d = 84/14 = 6 Therefore, common difference= 6 |
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