The value of 'p' for which the equation x2+pxy+y2-5x-7y+6=0 represents a pair of straight lines, is

Question

The value of '

p

' for which the equation

x^{2} + p x y + y^{2} - 5 x - 7 y + 6 = 0

represents a pair of straight lines, is

\frac{5}{2}

5

2

\frac{2}{5}

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