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12 Aug 2012, 13:34
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
53% (01:06) correct
47%
(00:57)
wrong
based on 158
sessions
History
Date
Time
Result
Not Attempted Yet
Does pqr equal r?
(1) pqs = s where s is some unknown number
(2) mpq = m where m is some unknown number
(1) pqs = s where s is some unknown number
(2) mpq = m where m is some unknown number
12 Aug 2012, 13:47
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Does pqr equal r?
Does \(pqr=r\)? --> does \(pqr-r=0\)? --> does \(r(pq-1)=0\)? --> does \(r=0\) or \(pq=1\)?
(1) pqs = s where s is some unknown number --> \(pqs=s\) --> \(pqs-s=0\) --> \(s(pq-1)=0\) --> \(s=0\) or \(pq=1\). Not sufficient.
(2) mpq = m where m is some unknown number --> \(mpq=m\) --> \(mpq-m=0\) --> \(m(pq-1)=0\) --> \(m=0\) or \(pq=1\). Not sufficient.
(1)+(2) If \(s=m=0\) then \(pq\) can take any value, so it may or may not equal to 1. Not sufficient.
Answer: E.
Does \(pqr=r\)? --> does \(pqr-r=0\)? --> does \(r(pq-1)=0\)? --> does \(r=0\) or \(pq=1\)?
(1) pqs = s where s is some unknown number --> \(pqs=s\) --> \(pqs-s=0\) --> \(s(pq-1)=0\) --> \(s=0\) or \(pq=1\). Not sufficient.
(2) mpq = m where m is some unknown number --> \(mpq=m\) --> \(mpq-m=0\) --> \(m(pq-1)=0\) --> \(m=0\) or \(pq=1\). Not sufficient.
(1)+(2) If \(s=m=0\) then \(pq\) can take any value, so it may or may not equal to 1. Not sufficient.
Answer: E.
13 Aug 2012, 10:52
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Cant combining equal PQ=1 ?
