Answer
GCF=4$y^{3}$
Work Step by Step
12$y^{4}$ ,20$y^{3}$ ,
12$y^{4}$ = 1*2*2*3*y*y*y*y
20$y^{3}$ = 1*2*2*5*y*y*y
GCF =1*2*2*y*y*y=4$y^{3}$
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