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Which of the following formula is correct for the computation of mode for a continuous frequency distribution?

A)  \[I+\frac{f-{{f}_{1}}}{2f-{{f}_{1}}-{{f}_{2}}}\times h\]          

B)  \[I-\frac{f-{{f}_{1}}}{2f-{{f}_{1}}-{{f}_{2}}}\times h\]

C)  \[I-\frac{f-{{f}_{1}}}{{{f}_{1}}+{{f}_{2}}}\times h\]              

D)  \[I+\frac{f-{{f}_{1}}}{f-{{f}_{2}}}\times h\]

E)  None of these