Question.2. 1,z1,z2,z3, ..., zn-1 are the nth root of unity, then the value of 1/(3-z1)+1/(3-z2)+...+1/(3-zn-1) is equal to (Complex Number)

a. (n*3^(n-1))/(3ⁿ-1)+1/2                       b. (n*3^(n-1))/(3ⁿ-1)-1

c. (n*3^(n-1))/(3n-1)+1                          d. none of these