find the ratio in which yz–plane divides the line joining (2, 4, 5) and (3, 5, 7)?

Dear Sagar,

Let the ratio be  λ : 1

                 x-coordinate is (3λ)+2/(λ+1) = 0  .

  therefore   : λ = -2/3.

so the required ration will be           -2   :   3

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