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# Let p, q{1,2,3,4}.Then number of equation of the form px^{2}+qx+1=0,having real roots ,is

- 15
- 9
- 7
- 8

## The correct answer is: 7

### q2–4p0

q=2 p=1

q=3 p=1,2

q=4 p=1,2,3,4

Hence 7 values of (p, q)7equationsarepossible.

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