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The sum of the series 3 1/2 +7 + 10 1/2 + 14 + .... to 17 terms is |
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Answer» Answer: Step-by-step EXPLANATION: a=t1=3.5 d=3.5 Sn=n/2[2A+(n-1) d] S17= 17/2 [ 2×3.5 + (17-1)3.5] = 8.5 [7 + 16×3.5] = 8.5 [7 + 56] = 8.5 ×63 = 51 |
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