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Calculates the (n-1) dimensional surface area of a sphere and the n dimensional volume of a ball in n-space.
sphereArea(n, R = 1) ballVolume(n, R = 1)
Dimension of the space.
Radius of the sphere/ball.
Single number that is the area of the sphere/volume of the ball.
# NOT RUN { sphereArea(n=5) ballVolume(n=5) # }
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