A bag contains 15 balls of which some are white and some are black the probability of drawing a black ball is 2 by 3 so find the
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The divergence theorem applies since 
is a closed surface. We have
where
is the space enclosed by the surface . The divergence of the given vector field is
So we can write the volume integral (in spherical coordinates) as
where
So we can write the volume integral (in spherical coordinates) as