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Write 'T' for true and 'F' for false for each of the following
(i) Mean proportional between 0.4 and 0.9 is 0.6
(ii)The third proportional to 9 and 12 is 10.5.
(iii) If `8 : x :: 48 : 18`, then x = 3
(iv)If `(3a + 5b): (3a - 5b) = 5 : 1` then `a : b = 5 : 2`

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