1. $$\frac{{\text{b}}}{2}$$
  2. $$\frac{{\text{d}}}{2}$$
  3. $$\frac{{{\text{b}}{{\text{d}}^2}}}{2}$$
  4. $$\frac{{{\text{b}}{{\text{d}}^2}}}{6}$$
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1 Answers

Answer: Option 4

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