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PS-Prep, time killer [#permalink]
28 Jun 2007, 08:19

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 0 sessions

Any suggestions for a quicker answer?

I was taking too long determining sign changes and adding / subtracting between each item (1-10) and ended up just guessing in order to move onto the next problem.

Looking for ways to cut down time on easy questions like this.

Re: PS-Prep, time killer [#permalink]
28 Jun 2007, 11:06

misterJJ2u wrote:

Any suggestions for a quicker answer?

I was taking too long determining sign changes and adding / subtracting between each item (1-10) and ended up just guessing in order to move onto the next problem.

Looking for ways to cut down time on easy questions like this.

Also D. 1 minute.

1. Find pattern. There has to be one, otherwise it wouldn't be a GMAT question. Very quickly see that this thing is just alternating positive and negative powers of 1/2:
1/2, -1/4, 1/8, -1/16....

2. Every change is smaller than the previous one. Classic GMAT game. I drew a number line:

Numbers start at 1/2, then down 1/4, then up 1/8, then down 1/16. You basically bounce back and fourth, but you NEVER cross 1/4, and you never cross 1/2.

Re: PS-Prep, time killer [#permalink]
28 Jun 2007, 11:25

ian7777 wrote:

misterJJ2u wrote:

Any suggestions for a quicker answer?

I was taking too long determining sign changes and adding / subtracting between each item (1-10) and ended up just guessing in order to move onto the next problem.

Looking for ways to cut down time on easy questions like this.

Also D. 1 minute.

1. Find pattern. There has to be one, otherwise it wouldn't be a GMAT question. Very quickly see that this thing is just alternating positive and negative powers of 1/2: 1/2, -1/4, 1/8, -1/16....

2. Every change is smaller than the previous one. Classic GMAT game. I drew a number line:

Numbers start at 1/2, then down 1/4, then up 1/8, then down 1/16. You basically bounce back and fourth, but you NEVER cross 1/4, and you never cross 1/2.

Re: PS-Prep, time killer [#permalink]
28 Jun 2007, 11:33

ian7777 wrote:

misterJJ2u wrote:

Any suggestions for a quicker answer?

I was taking too long determining sign changes and adding / subtracting between each item (1-10) and ended up just guessing in order to move onto the next problem.

Looking for ways to cut down time on easy questions like this.

Also D. 1 minute.

1. Find pattern. There has to be one, otherwise it wouldn't be a GMAT question. Very quickly see that this thing is just alternating positive and negative powers of 1/2: 1/2, -1/4, 1/8, -1/16....

2. Every change is smaller than the previous one. Classic GMAT game. I drew a number line:

Numbers start at 1/2, then down 1/4, then up 1/8, then down 1/16. You basically bounce back and fourth, but you NEVER cross 1/4, and you never cross 1/2.

1. Find pattern. There has to be one, otherwise it wouldn't be a GMAT question. Very quickly see that this thing is just alternating positive and negative powers of 1/2: 1/2, -1/4, 1/8, -1/16....

2. Every change is smaller than the previous one. Classic GMAT game. I drew a number line:

Numbers start at 1/2, then down 1/4, then up 1/8, then down 1/16. You basically bounce back and fourth, but you NEVER cross 1/4, and you never cross 1/2.

Etc, etc. It's a lot here to type out, on paper, really simple. Either way, you can see the range you're in pretty clearly.

Thanks Ian. That's exactly what I was looking for. I figured there was some easier way. Now I just have to be able to find it and apply it on test day!

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