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300 +\frac{700}{(1+1)^2}=2X\frac{(1+1)}{(1+1)^2}+3X\frac{(1+1)}{(1+1)^3}
300 +\frac{700}{(1+1)^2}=2X\frac{(1+1)}{(1+1)^2}+3X\frac{(1+1)}{(1+1)^3}
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