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section 19 #19

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dunkin77 Master | Next Rank: 500 Posts Default Avatar
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section 19 #19

Post Tue May 01, 2007 6:55 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    . Is ab = 1 ?
    (1) aba = a
    (2) bab = b


    Hi
    I thought the answer was D) but turned ouy to be E).... can you please help?

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    jayhawk2001 Community Manager
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    Post Tue May 01, 2007 8:57 pm
    dunkin77 wrote:
    . Is ab = 1 ?
    (1) aba = a
    (2) bab = b


    Hi
    I thought the answer was D) but turned ouy to be E).... can you please help?
    You cannot cancel out a in (1) without knowing that a != 0. Think of it
    this way x * 0 = 0. Can you cancel out 0 from both sides and say x = 1?
    No.

    Same with b in (2).

    Since we don't know that a!=0 and b!=0, the answer is E

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