kanikab wrote:
Hi - Apart from teh number substitution method, is this approach also correct -
-6 < r < 5 --------------- 1)
6 < w < 10 -------------- 2)
Multiplying 1& 2, we get -36 < rw < 50. Hence not sufficient.
Thanks,
kanikab, wouldn't suggest it as it's not intuitive.
Better to follow the order (i.e. check Statement (1), then Statement (2), so on) and insert values for the variables.
If the two statements are combined, \(-60 < rw < 50\).
Lower limit of \(rw\) would be \(-60\) and not \(-36\). (See? It isn't intuitive. You can get confused.)
Even if your resultant range of \(rw\) is considered, can't \(rw\) be \(0\) since \(0\) lies between \(-36\) and \(50\)?
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