[JEE Advanced 1994] let p q in 1 2 3 4 the number of equations px 2
Let $p,q\in\{1,2,3,4\}$. The number of equations $px^2+qx+1=0$ having real roots is
(a) $15$
(b) $9$
(c) $7$
(d) $8$
1 Answer
VAVidaara Admin
✓ Vidaara Team
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· 2d ago
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Correct answer: (c) $7$
Need $q^2\ge4p$: $q=2\!:p=1$; $q=3\!:p=1,2$; $q=4\!:p=1,2,3,4$. Total $1+2+4=7$.
JEE Advanced 1994 · Quadratic Equations and Inequations — verified solution by the Vidaara Team.
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