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10 Oct 2008, 09:36
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N
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Please help.
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Hi there,
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10 Oct 2008, 09:58
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Answer is C 
Basically the question is asking whether r = -s. If r = -s, then middle between -s and s is 0.
1) 0 < s.
nothing about r, so (INSUFFICIENT)
2) distance(r, t) = distance (-s, t)
case 1: if s is postive, -s must be left of s, then r = -s.
Then the answer to the question is YES (0 is mid point between r & s)
case 2: if s is negative, -s must be right of s,
Then the answer to the question is NO
Therefore, 2) is also INSUFFICIENT
Now if (1) & (2) are combined, (1) suggest that s is a postive, which makes ONLY case 1 in (2) true. NOW (1) and (2) combined, we know they are SUFFICIENT
Basically the question is asking whether r = -s. If r = -s, then middle between -s and s is 0.
1) 0 < s.
nothing about r, so (INSUFFICIENT)
2) distance(r, t) = distance (-s, t)
case 1: if s is postive, -s must be left of s, then r = -s.
Then the answer to the question is YES (0 is mid point between r & s)
case 2: if s is negative, -s must be right of s,
Then the answer to the question is NO
Therefore, 2) is also INSUFFICIENT
Now if (1) & (2) are combined, (1) suggest that s is a postive, which makes ONLY case 1 in (2) true. NOW (1) and (2) combined, we know they are SUFFICIENT
31 Oct 2008, 17:52
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C
Stmt1:In Suff
Stmt2: -s to could be to the right side of t - In Suff
Together: Suff
s is positive and r is at -s
Stmt1:In Suff
Stmt2: -s to could be to the right side of t - In Suff
Together: Suff
s is positive and r is at -s
