Question 83843
(y^5)^3(y^3)^2/(y^4)^4 (y^5)^3(y^3)^2/(y^4)^4 

= (y^15)(y^6) / (y^16)(y^15) / y^16

= y^21 / y^31 / y^16

= y^37 / y^31

= y^6

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Cheers,
Stan H.