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A and B are sectors of two different circles. Radius of sector A is double of that of sector B whereas central angle of sector B is double the central angle of sector A. The ratio of the area of sector A to the area of sector B is :
- (a)$1:1$
- (b)$1:2$
- (c)$2:1$
- (d)$4:1$
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(C) $2:1$