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modulus

GATE Civil Engineering · Complex Variables (CE) · 2005-2010

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B. S. Grewal — Higher Engineering Mathematics

Linear algebra, calculus, probability, numerical methods

The modulus of the complex number $${{3 + 4\,i} \over {1 - 2\,i}}$$ is

Which one of the following is not true for the complex number z 1 and z 2 ?