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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 `2.5.10…....(1+n^2) is equal to

A

`a^2-b^2`

B

`a^2+b^2`

C

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

D

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

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