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Question 1 of 20
Time: 00:00
If $z=x+iy$ then |z|=
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Difficulty: Hard
A:
$\sqrt{x^{2}+y^{2}}$
B:
$\sqrt{x^{2}-y^{2}}$
C:
$x^{2}+y^{2}$
D:
$x^{2}-y^{2}$
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