[" If "z(r)=cos(r alpha)/(n^(2))+i sin(r...

[" If "z_(r)=cos(r alpha)/(n^(2))+i sin(r alpha)/(n^(2))," where "r=1,2,3,....,n," then "lim_(n rarr oo)z_(1)z_(3)z_(3)...z_(n)" is equal "],[[" (a) "cos alpha+i sin alpha," (b) "cos(alpha/2)-i sin(alpha/2)],[" (c) "e^(i alpha/2)," (d) "root(3)(e^(i alpha))]]

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