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Option 1 : 1 cm = 40 m
Explanation:
Representative fraction (RF):
This scale is expressed in same units. For example, 1 cm = 50 m is represented in RF as 1: 5000 or 1/5000. Here 50 m is converted as 5000 cm.
Convert all options in RF
(i) 1 : 50000
(ii) 1 cm = 40 m is represented in RF as 1 : 4000 or 1/4000
(iii) 1 cm = 50 km , RF = 1 : 5000000
(iv) 1/300000
Compare all RF, we get largest scale, 1 cm = 40 m
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