If \( \omega \) is an imaginary cube root of unity, then \( \left(1...

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If \( \omega \) is an imaginary cube root of unity, then \( \left(1+\omega-\omega^{2}\right)^{7} \) is equal to
\( \mathrm{P} \)
(a) \( 128 \omega \)
(b) \( -128 \omega \)
(c) \( 128 \omega^{2} \)
(1998, 2M)
(d) \( -128 \omega^{2} \)
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