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Find the compounded ratio of:
(i) 2 : 3 and 4 : 9
(ii) 4 : 5, 5 : 7 and 9 : 11
(iii) (a - b) : (a + b), (a + b)2 : (a2 + b2) and (a4 - b4) : (a2 - b2)2