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2x^2+7xy+3y^2+8x+14y+lamda=0 will repres...

`2x^2+7xy+3y^2+8x+14y+lamda=0` will represent a pair of straight lines, when `lamda` is
(A) `2`
(B) `4`
(C) `6`
(D) `8`

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