This section contains 11 questions. Each question contains Statement I (Assertion) and Statement II (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which only one is correct. The choices are
(a) Both Statement I and Statement II are individually true and \( \mathrm{R} \) is the correct explanation of Statement I.
(b) Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I.
(c) Statement I is true but Statement II is false.
(d) Statement I is false but Statement II is true.
Statement I \( \sin \left(\frac{2 \pi}{7}\right)+\sin \left(\frac{4 \pi}{7}\right)+\sin \left(\frac{8 \pi}{7}\right)=-\frac{1}{2} \). Statement II \( \cos \frac{2 \pi}{7}+i \sin \frac{2 \pi}{7} \) is complex 7 th root of unity.
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