Question on Modulus

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: Question on Modulus

by jayhawk2001 » Fri Jun 15, 2007 10:25 am

f2001290 wrote:If xyz ≠ 0, is x (y + z) = 0?
(1) ¦y + z¦ = ¦y¦ + ¦z¦
(2) ¦x + y¦ = ¦x¦ + ¦y¦

Is it A ?

1 - y and z are either both positive or both negative. In anycase, y+z not
equal to zero and we already know x not eq 0. So, product cannot be
equal to zero. Sufficient.

2 - no idea about the value of z. if z = -y, then we could get 0.

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f2001290: Master | Next Rank: 500 Posts; Posts: 400; Joined: Sat Mar 10, 2007 4:04 am; Thanked: 1 times; Followed by:1 members

by f2001290 » Fri Jun 15, 2007 10:32 am

Even i went with A. But the OA says, its D.

I am confident that OA is wrong.

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