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If (1,5,35), (7,5,5), (1,λ,7) and (2λ,1,2) are coplanar, then the sum of all possible values of λ is

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If (1,5,35), (7,5,5), (1,λ,7) and (2λ,1,2) are coplanar, then the sum of all possible values of λ is

(1) 39/5

(2) -39/5

(3) 44/5

(4) -44/5

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1 Answer

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by (35.1k points)

Correct option is (3) 44/5

A(1, 5, 35), B(7, 5, 5), C(1, λ, 7), D(2λ, 1, 2)

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