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JEE Advance - Mathematics (1983 - No. 26)

The coefficient of $${x^4}$$ in $${\left( {{x \over 2} - {3 \over {{x^2}}}} \right)^{10}}$$ is
$${{{405} \over {256}}}$$
$${{{504} \over {259}}}$$
$${{{450} \over {263}}}$$
none of these

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