JEE Main 201610 Apr, Morning shiftMathematicsMediumSequence and Series179× since 2002
Let z = 1 + ai be a complex number, a > 0, such that z³ is a real number.
Then the sum 1 + z + z² + . . . . .+ z¹¹ is equal to :
JEE Main 2016 · 10 Apr, Morning shift · Q5294