since r,s are roots of the equation and product of roots is c, the question is asking whether c<0 or not?sud21 wrote:If r and s are root of x^2+bx+c=0, rs<0?
1). b<0
2). c<0
1) insuff.
2) suff.
user123321
number properties
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1) insuff.
2) suff.
user123321
Just started my preparation 
Want to do it right the first time.
Want to do it right the first time.
