Complex NumbersHard
Question
If x2 + x + 1 = 0, then the numerical value of
+.......+ 
is equal to
+.......+ is equal to Options
A.54
B.36
C.27
D.18
Solution
there are 9 term which have ω3p.
so sum 9 × 4 = 36
there are 18 term which not have ω3p
so sum is = 18
total sum = 18 + 36 = 54
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