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O.G 12 PS 89

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by ssmiles08 » Wed May 13, 2009 6:53 pm
Can someone please help me out with this following problem. I have an Idea but don't really understand the solution given by the book. It's been a long day! Thanks in advance!

If s is the product of the integers 100 to 200 inclusive and t is the product of integers from 100 to 201 inclusive, what is 1/s +1/t in terms of t?

(A) (201)^2/t

(B) [(202)(201)]/t

(C) (201)/t

(D) 202/t

(E) [(202)(201)]/t^2



OA : D
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Solution

by syr » Wed May 13, 2009 7:53 pm
Here you go ..

s = 100 * 101 * .... * 200
t = 100 * 101 * .... * 200 * 201
i.e t = s * 201

Therefore, s = t/201
Also, 1/s = 201/t

Hence,
1/s + 1/t
= 201/t + 1/t
= 202/t

Hope that helps.

Thanks,
syr
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Re: O.G 12 PS 89

by Pranay » Thu May 14, 2009 2:17 am
Hi Syr,

Great solution. :)

Hi ssmiles08,

Its been long time since I am looking for an OG12.

Could you please let me know the source for it. It would be great if you can share incase you have a soft copy of it.

My E-Mail is - [email protected]

It would be really helpful.

Pranay.
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by ssmiles08 » Thu May 14, 2009 6:35 am
Thank you! it seems simple enough!

Pranay - I picked up the O.G 12th ed. at a local Barnes and Nobles. So I have the hard copy.
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