1.

If the radius of a sphere is increased by 2.5 decimetre (dm), then its surface area increases by 110 dm2. What is the volume (in dm3) of the sphere?(Take π = \(\frac{22}{7}\))

A. \(\frac{4}{7}\)
B. \(\frac{3}{7}\)
C. \(\frac{13}{21}\)
D. \(\frac{11}{21}\)
Answer» E.


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