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Source: — Data Sufficiency |
Newbie | Next Rank: 10 Posts
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by Kalvin » Thu Nov 19, 2009 3:07 pm
mariah wrote:Is lxl< 1?
(1) lx + 1l = 2lx - 1l
(2) lx- 3l≠ 0

pls explain ... i am having trouble with modules
Is lxl< 1? => Is -1<x<1?

(1) lx + 1l = 2lx - 1l => x is = to 1/3 or 3 [Not sufficient]

(2) lx- 3l≠ 0 => x is not = to 3 [Not sufficient]

Answer is C
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by adamsmith2009 » Thu Nov 19, 2009 4:18 pm
For A - how does X = 1/3. If I plug it back into the equation it doesn't work. Or am I missing something?
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by Kalvin » Thu Nov 19, 2009 4:26 pm
adamsmith2009 wrote:For A - how does X = 1/3. If I plug it back into the equation it doesn't work. Or am I missing something?
1/3 + 1 = 4/3 => |4/3| = 4/3

1/3 - 1 = -2/3 => |-2/3| = 2/3 => 2 * 2/3 = 4/3
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