1. $$2{\text{E}}{{\text{C}}_{\text{S}}}$$
  2. $$\frac{{{\text{E}}{{\text{C}}_{\text{S}}}}}{2}$$
  3. $$2{\text{E}}{{\text{C}}_{\text{S}}}^2$$
  4. $$2{{\text{E}}^2}{{\text{C}}_{\text{S}}}$$
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1 Answers

Answer: Option 1

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