Complex NumbersHard

Question

If z1, z2 and z3are complex number such that |z1| = |Z2| = |z3| = , then |z1 + z2 + z3| is

Options

A.equal to 1
B.less than 1
C.greater than 3
D.equal to 3

Solution

If z1, z2 and z3are complex number such that |z1| = |Z2Given, |z1| = |Z2| = |z3|= 1
Now,      |z1| = 1
⇒         |z1|2 = 1
⇒         z11 = 1
Similarly, z22 = 1, z33 = 1
Againb now,  
⇒        
⇒        
⇒         |z1 + z2 + z3| = 1
| = |z3|
= , then |z1 + z2 + z3| is

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