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Intern
Joined: 28 Aug 2006
Posts: 8

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28 Oct 2006, 11:06
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Hi,

I took the 1st GMAT Prep Practise Test a couple of days ago.

Came across a few questions for which I felt I could use a more elaborate explanation. So would be very grateful to anyone who could provide the same.

Thanks.

Zippo

P.S.: Have attached the questions in a word file. Sorry but I could n't post them
Attachments

GMAT Prep Quant Post 1.doc [175.5 KiB]

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Senior Manager
Joined: 08 Jun 2006
Posts: 335

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Location: Washington DC

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28 Oct 2006, 11:55
Sum = Â½ - Â¼ + 1/8 + -1/16 + 1/32 -1/64 .....
= Â¼ +1/8 -1/16 +1/32 -1/64 ....

1/8 > 1/16, Similarly 1/32 >1/64, terms that are added is greater than the subtracted terms
1/8 is added to Â¼ and 1/16 is subtracted ...so the result is > Â¼

... but the sum will never exceed Â½

Answer is between Â½ and 1/4

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28 Oct 2006, 11:55
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