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[" 10.If "(1+i)(1+2i)(1+3i)....(1+ni)=a+...

[" 10.If "(1+i)(1+2i)(1+3i)....(1+ni)=a+ib," then "2.5.10.17],[[" (a) "a-ib," (b) "a^(2)-b^(2)," (c) "a^(2)+b^(2)," (d) none of these "]]

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