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I) given a = 7, 913 =35, find d and S13. |
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Answer» Step-by-step EXPLANATION: a =7 S13=n/2 (2a+(n-1)d) = 13/2(14 +12D ) =35 =13/2 *2(7 +6D) =35 =91 + 78d = 35 = 78d= 35 -91 = d = -56/78. = -14/17
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