Answer :

[tex]\begin{gathered} 3x^2y+4x-6y+4x^2y-2y \\ \text{collecting like terms, we have} \\ =3x^2y+4x^2y+4x-6y-2y \\ =7x^2y+4x-8y \end{gathered}[/tex]

Correct option is option 4

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