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test 19 #20

This topic has 1 member reply
dunkin77 Master | Next Rank: 500 Posts Default Avatar
Joined
01 Apr 2007
Posted:
269 messages

test 19 #20

Post Tue May 01, 2007 7:32 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    I think to meet the condition, x must be positive, but why 2) meet the condition?? the answer is B but could not figure out,..
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    jayhawk2001 Community Manager
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    Post Tue May 01, 2007 9:00 pm
    dunkin77 wrote:
    Hi,

    I think to meet the condition, x must be positive, but why 2) meet the condition?? the answer is B but could not figure out,..
    sqrt [ (x-3)^2 ] will yield a positive answer. Now, depending on the
    sign of x, it will be either x-3 or 3-x.

    1 - insufficient. x can be > 3 or < 3. So, we don't know if it will be
    equal to 3-x

    2 - sufficient. -x|x| will be positive when x is negative. Since x is
    negative, the final answer will be 3-x and hence sufficient.

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