Doubt from infinite series



Please tell @Dishi_2020 what we have to solved in this problem??


Find value of y


Are u sure 3x² term is there and is the answer 1/1-x?


Is it 1/(1-x) ?


Answer is 1/1-x


If 3x² term exists then your answer is not correct


Answer is not looking good so i have posted initial steps you can differentiate it and find the result

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You have made a slight mistake. The Coeff of x^6 will be 4 not 3. I see what you were thinking. But x^6 will also be formed from x, x^2, x^3. You have only considered coeef which formed from multiplication of 2 terms. But multiplication of 3/4/5.. terms may also form the coeff.