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Find the sum of first 10 termsof an AP :31,26,21,16 |
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Answer» Answer: 85 Step-by-step explanation: Sn=n/2[2A+(n-1)d] =10/2[2(31)+(10-1)-5] =5[62-45] =85 d is -5 because 26-35=-5 Hope it helps |
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