If \( 2 x+3 y=\alpha, x-y=\beta \) and \( k x+15 y=r \) are 3 concurrent normal of parabola \( y...

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If \( 2 x+3 y=\alpha, x-y=\beta \) and \( k x+15 y=r \) are 3 concurrent normal of parabola \( y^{2}=\lambda x \) then value of \( k \) is
(A) 3
(B) 4
(C) 5
(D) 7
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