section 19 #19

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pm; Location: Silicon valley, California; Thanked: 30 times; Followed by:1 members

Re: section 19 #19

by jayhawk2001 » 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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