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JEE Advance - Mathematics (1998 - No. 43)
If $${\omega}$$ is an imaginary cube root of unity, then $${(1\, + \omega \, - {\omega ^2})^7}$$ equals
$$128\omega $$
$$ - 128\omega $$
$$128{\omega ^2}$$
$$ - 128{\omega ^2}$$
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