\textbf{127.} A frustum with bases of radii 2 and 5 and slant height 3 units is rotated about the axis of the right cone. What is the volume of the resulting solid?
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(1) $360\pi$ \hfill (2) $380\pi$ \hfill (3) $390\pi$ \hfill (4) $400\pi$
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