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If $(1+i)(1+2i)(1+3i).....(1+ni)=x+iy$, then $2.5.10.....(1+n^2)$ = ?

$\begin{array}{1 1}(A) \; x^2+y^2 \\(B)\;x^2-y^2 \\(C)\;(x+iy)^2 \\(D)\; (x-iy)^2 \end{array}$

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