If \( z_{r}=\cos \frac{2 r \pi}{5}+i \sin \frac{2 r \pi}{5}, r=0,1,2,3,4, \ldots . \). then \( z...
If \( z_{r}=\cos \frac{2 r \pi}{5}+i \sin \frac{2 r \pi}{5}, r=0,1,2,3,4, \ldots . \). then \( z_{1} z_{2} z_{3} z_{4} z_{5} \) is equal to
(a) \( -1 \)
(b) 0
(c) 1
(d) none of these
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