(main)[4]
Determine the coefficient of $\frac{1}{x^2}$ in the expansion of $(3x + \frac{2}{3x^2})^7$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A correct term has been chosen from the expansion, for example a term involving $\frac{1}{x^2}(3x)^4$ or $3^4$.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI