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Fundamental Principle of Counting
Using D> or = 0 , we have q^2-4p> or = 0 let q=2 , then we have p=1 only... now let q=3 , here we have p=1 or 2... now let q= 4 , then we have p=1 or 2 or 3 or 4 ... thus total 7 equations are possible with real roots...