B1 is a point on the side AC of ΔABC and B1B is joined. A line is drawn through A parallel to B1B meeting BC at A1 and another line is drawn through C parallel to B1B meeting AB produced at C1. Then
A. $$\frac{1}{{{\text{C}}{{\text{C}}_1}}} - \frac{1}{{{\text{A}}{{\text{A}}_1}}} = \frac{1}{{{\text{B}}{{\text{B}}_1}}}$$
B. $$\frac{1}{{{\text{C}}{{\text{C}}_1}}} + \frac{1}{{{\text{A}}{{\text{A}}_1}}} = \frac{1}{{{\text{B}}{{\text{B}}_1}}}$$
C. $$\frac{1}{{{\text{B}}{{\text{B}}_1}}} - \frac{1}{{{\text{A}}{{\text{A}}_1}}} = \frac{1}{{{\text{C}}{{\text{C}}_1}}}$$
D. $$\frac{1}{{{\text{B}}{{\text{B}}_1}}} + \frac{1}{{{\text{A}}{{\text{A}}_1}}} = \frac{1}{{{\text{C}}{{\text{C}}_1}}}$$
Answer: Option B
This Question Belongs to Arithmetic Ability >> Geometry
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