Question

B1 is a point on the side AC of ∆ ABC and B1B is joined. 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 1/CC1 – 1/AA1 = 1/BB1
B 1/CC1 + 1/AA1 = 1/BB1
C 1/BB1 – 1/AA1 = 1/CC1
D 1/AA1 – 1/CC1 = 1/BB1
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