A straight line L cuts the sides AB, AC,...

A straight line L cuts the sides AB, AC, AD of a parallelogram ABCD at `B_(1), C_(1), d_(1)` respectively. If `vec(AB_(1))=lambda_(1)vec(AB), vec(AD_(1))=lambda_(2)vec(AD) and vec(AC_(1))=lambda_(3)vec(AC),` then `(1)/(lambda_(3))` equal to

`(1)/(lambda_(1))+(1)/(lambda_(2))`

`(1)/(lambda_(1))-(1)/(lambda_(2))`

`-lambda_(1)+lambda_(2)`

`lambda_(1)+lambda_(2)`

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