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If (1-i)(1-2i)(1-3i)…..(1-ni)=x-iy , the...

If `(1-i)(1-2i)(1-3i)…..(1-ni)=x-iy` , then `2.5.10 ……(1+n^2)=`

A

`x^2+y^2`

B

`x+y`

C

`x^2-y^2`

D

`x-y`

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The correct Answer is:
A
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