A) \[l+\frac{f-{{f}_{1}}}{2f-{{f}_{1}}-{{f}_{2}}}\times h\]
B) \[l-\frac{f-{{f}_{1}}}{2L-{{f}_{1}}-{{f}_{2}}}\times h\]
C) \[l-\frac{f-{{f}_{1}}}{2L+{{f}_{1}}-{{f}_{2}}}\times h\]
D) \[l+\frac{f-{{f}_{1}}}{{{f}_{1}}-{{f}_{2}}}\times h\]
E) None of these
Correct Answer: A
Solution :
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