1.

If the point z = (1+i) (1+2i)(1+3i)…(1+10i) lies on a circle with centre at origin and radius r, then r^(2) =

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10!
`2 xx 3 xx 4 xx …… xx 10`
`2 xx 5 xx 10 xx … xx 101`
11!

Answer :c


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