From Stmt 2 it can be deduced that r = -s. SO s should be positive,i.e to the right of zero and r should be negative.
Why is the answer C?
Why is the answer C?
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st.1: It does not tell you the relative position of r and t. Not sufficient.
St.2. If s>0, then 0 is halfway between r and s. If s<0, r<0. So zero cannot be half way between r and S. Not sufficient.
Therefore, the answer is C.
