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Re: N is an integer. Is N negative ? [#permalink]
27 Jun 2013, 15:15

N is an integer. Is N negative ?

(1) |N| = -N -N is equal to an absolute value which means it must be positive. So, -N = -(-N). However, N can also equal zero as |0| = -0 is valid. N ≤ 0 but we can't be sure if N is negative or not. INSUFFICIENT

(2) N^4 = N^2 N^4 = N^2 when n = -1, 0, 1. Again we can't tell if N is positive, zero or negative.

1+2) 1) tells us that n is zero or negative and 2) tells us that n is negative or zero or positive. Therefore, N could be negative or zero. INSUFFICIENT

(E)

gmatclubot

Re: N is an integer. Is N negative ?
[#permalink]
27 Jun 2013, 15:15

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