1. $$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$
  2. $$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$
  3. $$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$
  4. $$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$
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1 Answers

Answer: Option 2

Let'

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