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Question

If the modulus of a complex number z = a + ib 5 units, then the modulus of a - ib is ___ units.

A
15
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B
25
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C
5
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D
Not possible to find
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Solution

The correct option is C 5
Since modulus of z = modulus of ¯z.
So modulus of a + ib = modulus of a - ib.

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