1) The value of $(1+\omega-\omega^{2})^{7}$ A) $128\omega^{2}$ B) - $128\omega^{2}$ C) $128\omega^{}$ D) $128\omega^{}$ Answer: Option BExplanation:$(1+\omega-\omega^{2})^{7}=(-\omega^{2}-\omega^{2})^{7}=(-2\omega^{2})^{7}$ $=-128(\omega^{4})^{3}\omega^{2}=-128\omega^{2}$
