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If s is the product of the integers from 100 to 200,

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If s is the product of the integers from 100 to 200, [#permalink]

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If s is the product of the integers from 100 to 200, inclusive, and t is the product of the 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)]/t2

Im lost here. Pls explain.
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Re: PS: Product of integers [#permalink]

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New post 02 Jan 2006, 22:18
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JAI HIND wrote:
If s is the product of the integers from 100 to 200, inclusive, and t is the product of the 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)]/t2

Im lost here. Pls explain.


t=100*101*.....*200*201
s= t/201

--> 1/s +1/t = 1/ (t/201) + 1/t= 201/t+ 1/t = 202/t
VP
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Re: PS: Product of integers [#permalink]

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New post 02 Jan 2006, 22:24
JAI HIND wrote:
If s is the product of the integers from 100 to 200, inclusive, and t is the product of the 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)]/t2

Im lost here. Pls explain.


D

S = 200!/99!
T = 201!/99!

1/S = 99!/200!
1/T = 99!/201!

1/S + 1/T = 99!/200! + 99!/201! = 201*99!/200!*201 + 99!/201*200! = 99! (201+1)/201*200! = 99! (202) / 201! = 202*(1/T)
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Re: PS: Product of integers [#permalink]

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New post 02 Jan 2006, 22:28
laxieqv wrote:
JAI HIND wrote:
If s is the product of the integers from 100 to 200, inclusive, and t is the product of the 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)]/t2

Im lost here. Pls explain.


t=100*101*.....*200*201
s= t/201

--> 1/s +1/t = 1/ (t/201) + 1/t= 201/t+ 1/t = 202/t


:cool :cool
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 [#permalink]

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New post 03 Jan 2006, 22:15
D for me too
s=t/201
Replace that in equation to get 202/t
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Re: If s is the product of the integers from 100 to 200, [#permalink]

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New post 22 Feb 2016, 11:31
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Re: If s is the product of the integers from 100 to 200, [#permalink]

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New post 22 May 2017, 19:25
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: If s is the product of the integers from 100 to 200,   [#permalink] 22 May 2017, 19:25
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