Divide :
$- 54 x^{2} y^{4} z^{3} b y 9 x^{4} y^{3} z^{7}$

\frac{x^{2} z^{4} a}{y}

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\frac{x^{2} z a}{3 y}

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\frac{x z^{4} a}{3 y}

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None of these

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Solution

The correct option is D None of these
$\frac{- 54 x^{2} y^{4} z^{3}}{- 9 x^{4} y^{3} z^{7}} = \frac{6 y}{x^{2} z^{4}}$ .
Think:
$x^{2} \div x^{4} = x^{2 - 4} = x^{- 2} = \frac{1}{x^{2}}$
$y^{4} \div y^{3} = y^{4 - 3} = y$
$z^{3} \div z^{7} = z^{3 - 7} = z^{- 4} = \frac{1}{z^{4}}$

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