Which term of the series (28-16i) + (27-14i) + (26-12i) +….is purely imaginary.

Which term of the sequence : 8-6i, 7 - 4i, 6- 2i,.......... is pure imaginary ?

Which term of the sequences 8-6i, 7-4i, 6-2i, …………….is a real number?

Find the least positive integral value of n, for which ((1-i)/(1+i))^n , where i=sqrt(-1), is purely imaginary with positive imaginary part.

Solve ( sin x + "i" cos x )/( 1 +i),i =sqrt(-1) when it is purely imaginary .

Find the square roots of - 48-14i .

The smallest positive integral value of ‘n’ such that [(1+sin frac (pi)(8)+i cos frac (pi)(8))/(1+sin frac (pi)(8)-i cos frac (pi)(8))]^n is purely imaginary is n =

If z=(3+7i)(lambda+imu)," when " lambda,mu in I-{0} " and " i=sqrt(-1) , is purely imaginary then minimum value of abs(z)^(2) is a. 0 b. 58 c. 3364/3 d. 3364

Which term of sequence 36, 31, 26, 21, 16... is the first negative term ?

Solve ix^2 - x + 12i= 0 .

Find the sum of n terms of the series whose nth terms is (i) n(n-1)(n+1) .