Suppose that a and b are positive real numbers such that log _27 a+log _9 b=7/2 and log _27 b+log...

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Suppose that a and b are positive real numbers such that log _27 a+log _9 b=7/2 and log _27 b+log _9 a=2/3. Then the value of a · b is :
(a) 81
(b) 243
(c) 27

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