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x^2\ x\ \ 2y^3\ x\ \ 5x^3y^2 is equal to...

`x^2\ x\ \ 2y^3\ x\ \ 5x^3y^2` is equal to: `10 x^2y^5` (b) `10 x^5y^2` `10 x^5y^5` (d) `x^5y^5`

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