Answer:
6x^4y^2
Explanation:
6x^4y^3 = 6x^4y^2(y)
12x^6y^2 = 6x^4y^2(2x^2)
18x^5y^4 = 6x^4y^2(3xy^2)
So
GCF = 6x^4y^2
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