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Question

If three complex numbers are in ap then they lie on

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Solution

2Z2=Z1+Z3
2(x2+iy2)=(x1+x3)+i(y1+y3)
comparing real and imaginary parts
x2=x1+x3/2 , y2=y1+y3/2
Z2 is midpoint of Z1andZ3
they lie on a st.line


Then they lie in same plane,line

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