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The common difference of an AP is 12 whose nth term is a n then find the value of a20-a17 |
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Answer» let the first term be a , and GIVEN that COMMON difference , d =12 so, a20 = a +19D and a17 = a+16d now, a20 -a17 = (a +19d) - (a +16d) = 3D = 3× 12 = 36 formula used , an = a + (N -1)d. |
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