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let `A_1,A_2,A_3,...A_n` are the vertices of a regular n sided polygon inscribed in a circle of radius R. If `(A_1A_2)^2+(A_1A_3)^2+....(A_1A_n)^2`=`14R^2` then find the number of sides in the polygon.

A

3

B

4

C

5

D

None of these

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