If $y=3x+6{x}^{2}+10{x}^{3}+\ldots \ldots \ldots ∞$, then $\frac{1}{3}y−\frac{1\cdot 4}{{3}^{2}\cdot 2}{y}^{2}+\frac{1\cdot 4\cdot 7}{{3}^{2}\cdot 3}{y}^{3}−\ldots \ldots ∞$ is equal to

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If \(y=3x+6{x}^{2}+10{x}^{3}+\ldots \ldots \ldots ∞\), then \(\frac{1}{3}y−\frac{1\cdot 4}{{3}^{2}\cdot 2}{y}^{2}+\frac{…

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