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2015-03-07T11:14:47+08:00

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9 and 16 are the extreme , let n be the mean so,

9 : n = n :16
(9)(16) = (n)(n)
n² = 144            (square root of 144 is 12)
n = 12

the mean proportional between 9 and 16 is 12.
the final answer is letter C.
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