chatterjee06 wrote:
Is the product st negative?
(1)s^2 – s < 0
(2) s-4 =t-3
.
(1) It means that0<s<1 . Nothing aboutt . Insufficient.
(2)t=s-1 , don't know signs ofs andt . Insufficient.
(1)+(2) Since0<s<1 andt=s-1 , then-1<t<0 . Hence,st<0 . Sufficient.
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