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a
z is purely imaginary
b
z is purely real
c
z=0
d
none of these
answer is B.
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Detailed Solution
Conjugate of zequals the determinant obtained by taking conjugate of each of its element. Therefore,z¯=11+2i3−5i1−2i−5−10i3+5i10i11=11−2i3+5i1+2i−510i3−5i−10i11=zThus, z is purely real.