I was thinking B instead.

1 is Insuff as it gives no info on % of day 2
2 is sufficient.

Day 1 = .1X did not attend
Day 2 = .2X did not attend.

So what % did not attend on both days.
30% did not attend.. Although I am not too sure if my methodology is right.

I found it really tough as well.

So tough, that I just got depressed and left studying from the CR Bible. So now I'm just concentrating on the OG and the questions posted on the forum.

I'd say D as well for the same reasons as provided by bbanker1.

gmatrant:

It's not D, because D is just the premise worded differently.

I initially was thinking the same when I did the problem, but in CR's if the premise is part of the solution, it's usually worded differently and is always the wrong answer.

I guess it all depends on your study schedule and the time you allot to study for the exam.

There are quite a few posts on the forum regarding this.

I've been studying for the past month and while my Quant has shown improvement.. my verbal skills are horrible .

A few PS questions

1) If 10 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes? (A) 10•9•8•7•6•5•4•3•2•1 (B) 10•10 (C) 10•9 (D) 45 (E) 36 OA: D I thought it will be 10•9 , since each person shakes hand 10 times with everyone. So 10*9. 2) ...