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Combination

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equations are $\left ( \frac{1-x^{11}}{1-x} \right ).\left ( \frac{1-x^{6}}{1-x} \right )\left ( \frac{1-x^{4}}{1-x} \right )$

=(1-x11)(1-x6)(1-x4)(1-x)-3

right?

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