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minustark
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55%
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38% (00:56) correct
63%
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True or false: N is a positive number.
Statement 1: N=|N|
Statement 2: N>N^2
Statement 1: N=|N|
Statement 2: N>N^2
25 Sep 2019, 08:34
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Statement 2 is sufficient.
Statement 1 says,
|N|=N, only true when N>=0
Question asks is N +ve or -ve, but N can be 0 as stated above (0 is non-negative)
Hence not sufficient
Statement 2 Says
N>N^2
N^2 is always >=0
so, N>0
sufficient
Statement 1 says,
|N|=N, only true when N>=0
Question asks is N +ve or -ve, but N can be 0 as stated above (0 is non-negative)
Hence not sufficient
Statement 2 Says
N>N^2
N^2 is always >=0
so, N>0
sufficient
25 Sep 2019, 09:32
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minustark
True or false: N is a positive number.
Statement 1: N=|N|
Statement 2: N>N^2
Statement 1: N=|N|
Statement 2: N>N^2
Statement 1: N=|N|
N could be 0 -> No N is not positive
N could be 1,2,3.etc ( any positive number) -> yes N is positive
Hence Insuff.
Statement 2:N>N^2
->N^2-N<0
->N(N-1)<0
->0< N <1 hence N can only be positive. Suff.
Ans- B
