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

by jayhawk2001 » Thu Jun 07, 2007 9:25 pm

Is it C?

1 - not sufficient.

2 - not sufficient. We have 2 possibilities

a. t-r = t-(-s) implies r = -s

b. ----r----s----t---- -s ----

Using 1 we know choice b above is not possible. So, C

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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Sat Jun 09, 2007 11:41 am

now, I agree that it's C - cause t&r = t&-s meaning that r=-s. So, if 0 is between s and -s, s and r must be so too.

Thank you for your help!

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