Stm1)
n > -1
This does not give any information about p, so not sufficient
Stmt 2)
np > 0
This means either both n and p are positive, or n and p are negative. Again, using just this information, p could be +ve or -ve, so not sufficient
combining 1 + 2, we know that n > -1 i.e. n could be negative or positive, and stmt 2 tells u p is np is positive, which means p could be either negative or positive. this is unsufficient to answer the question.
Hence (E)
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Gmat Prep test problem
Source: Beat The GMAT — Data Sufficiency |
IMO Csdotcruz wrote:If n and p are integers, is p>0?
(1) n+1 > 0
(2) np > 0
can someone break it down for me?
Statement 1 tells us that n is positive. But tells us nothing about p.
Statement 2 tells us that either n and p are both positive or both negative.
Taken together, from Statement 1, n is positive, from statement 2, when n is positive, p is positive. P>0
Therefore the answer is C.
ah you're right, I missed the part which says they are "integers"tlt2372 wrote:IMO Csdotcruz wrote:If n and p are integers, is p>0?
(1) n+1 > 0
(2) np > 0
can someone break it down for me?
Statement 1 tells us that n is positive. But tells us nothing about p.
Statement 2 tells us that either n and p are both positive or both negative.
Taken together, from Statement 1, n is positive, from statement 2, when n is positive, p is positive. P>0
Therefore the answer is C.
.. I was also considering -0.5 and so on... should be (C)
