Sum upto n terms of the series yn=1+(1+x)+(1+x+x2)+(1+x+x2+x3)+⋯+(1+ – InterviewSolution

1.	Sum upto n terms of the series yn=1+(1+x)+(1+x+x2)+(1+x+x2+x3)+⋯+(1+x+x2+⋯+xn) is true for n∈N, then yn is
Answer» Sum upto $n$ terms of the series $y_{n} = 1 + (1 + x) + (1 + x + x^{2}) + (1 + x + x^{2} + x^{3}) + \dots + (1 + x + x^{2} + \dots + x^{n})$ is true for $n \in N,$ then $y_{n}$ is

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