Express all quantities in the same unit, then simplify by dividing by the common factor.<br><br>
&bull; 2&nbsp;m : 150&nbsp;cm : 50&nbsp;cm<br>
&bull; 200&nbsp;cm : 150&nbsp;cm : 50&nbsp;cm<br>
&bull; Divide each by 50: 4 : 3 : 1<br>
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Final Answer: 4 : 3 : 1