The interior angles of a polygon are in A.P. If the smallest angle ...

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The interior angles of a polygon are in A.P. If the smallest angle is \( 120^{\circ} \& \) the common difference is \( 5^{\circ} \), then the number of sides in the polygon is:
(A) 7
(B) 9
(C) 16
(D) 5
P
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