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If (1+i)(1+2i)(1+3i)"……."(1+ni)=a+ib," t...

If `(1+i)(1+2i)(1+3i)"……."(1+ni)=a+ib," then "2xx5xx10xx"………"xx(1+n^2)` is equal to

A

`a^(2)+b^(2)`

B

`sqrt(a^(2)+b^(2))`

C

`sqrt(a^(2)-b^(2))`

D

`a^(2)-b^(2)`

Text Solution

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The correct Answer is:
A
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