Group all the unlike terms from among the given terms.
$- 7 x y^{2}, 8 x^{2}, 9 x^{3}, - 100 x, - 11 y x, 20 y^{2} x, 96 x, - 7 x^{2}, 67 x y, 7 x^{4}, 3 x^{2}, - 11 x^{2} y$ .

- 7 x y^{2}, 20 y^{2} x, - 11 x^{2} y

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9 x^{3}, - 11 x^{2} y, 7 x^{4}

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8 x^{2}, - 11 y x, 9 x^{3}

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- 11 x^{2} y, 67 x y, 7 x^{4}

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Solution

The correct option is B $9 x^{3}, - 11 x^{2} y, 7 x^{4}$
The terms given are,
$- 7 x y^{2}, 8 x^{2}, 9 x^{3}, - 100 x, - 11 y x, 20 y^{2} x, 96 x, - 7 x^{2}, 67 x y, 7 x^{4}, 3 x^{2}, - 11 x^{2} y$

Unlike terms are terms which contain different variables or same variables but raised to different power.

$∴$ Among the given terms, $9 x^{3}, - 11 x^{2} y, 7 x^{4}$ are unlike terms.

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- 7 x y^{2}, 8 x^{2}, 9 x^{3}, - 100 x, - 11 y x, 20 y^{2} x, 96 x, - 7 x^{2}, 67 x y, 7 x^{4}, 3 x^{2}, - 11 x^{2} y

- 7 x y^{2}, 8 x^{2}, 9 x^{3}, - 100 x, - 11 y x, 20 y^{2} x, 96 x, - 7 x^{2}, 67 x y, 7 x^{4}, 3 x^{2}, - 11 x^{2} y

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