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Find the sum of the following series upto n terms 1+5+11+19+.... |
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Answer» e here is your ANSWER Answer:1=15= 1+411=5+619 = 11+829= 19 + 10...The add all the equations and cancell the common TERMS to getTn = 1+{4+6+8+10+....to N terms}= 1+2{2+3+4+5+.... n terms} = 1+(n+2)(n-1) = n^2 + n -1Now the reqd sum = n(n+1)(2n+1)/6 + n(n+1)/2 + n.I assume that you know the summation formulae. If not revise those first!I hope it helps you and mark brainliest ✌✌✌✌ |
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