1. $${\text{c}}\left( {{\text{m}} - {\text{M}}} \right){\text{g}}$$
  2. $${\text{c}}\left( {{\text{m}} + {\text{M}}} \right){\text{g}}$$
  3. $$\frac{{\text{c}}}{{\left( {{\text{m}} + {\text{M}}} \right){\text{g}}}}$$
  4. $$\frac{{\text{c}}}{{\left( {{\text{m}} - {\text{M}}} \right){\text{g}}}}$$
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Answer: Option 2

Let'

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