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If (1+i) (1+2i) (1+3i) ….. (1+ni ) = x+...

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

A

0

B

1

C

`1+n^(2)`

D

`x^(2) +y^(2)`

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The correct Answer is:
B
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