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Two wooden solid hemispheres of same radii $r$, are joined at a point, as shown in the figure. The total surface area of the object is :
- (a)$4\pi r^2$
- (b)$3\pi r^2$
- (c)$6\pi r^2$
- (d)$5\pi r^2$
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Answer : (B) $6\pi r^2$