A) \[\frac{w}{{{w}_{1}}}\]
B) \[\frac{w{{l}_{1}}}{wl-{{w}_{1}}{{l}_{2}}}\]
C) \[\frac{{{l}_{1}}}{{{l}_{1}}-{{l}_{2}}}\]
D) \[\frac{{{l}_{1}}}{{{l}_{2}}}\]
Correct Answer: C
Solution :
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