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## section 19 #19

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

#### section 19 #19

Tue May 01, 2007 6:55 am
. Is ab = 1 ?
(1) aba = a
(2) bab = b

Hi

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

Hi
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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