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crazy integer multiplication

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Manager
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Joined: 19 Sep 2005
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crazy integer multiplication [#permalink] New post 08 Nov 2005, 21:09
How do you solve this one quickly?

For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n inclusive. If p is the smallest prime factor of h(100) + 1, then p is
a. between 2 and 10
b. b/n 10 and 20
c. b/n 20 and 30
d. b/n 30 and 40
e. greater than 40

thanks!
SVP
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Re: crazy integer multiplication [#permalink] New post 08 Nov 2005, 21:17
Jennif102 wrote:
How do you solve this one quickly?

For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n inclusive. If p is the smallest prime factor of h(100) + 1, then p is
a. between 2 and 10
b. b/n 10 and 20
c. b/n 20 and 30
d. b/n 30 and 40
e. greater than 40

thanks!


This problem was posted several times not long ago...you may search for it. Btw, it's E.
Director
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 [#permalink] New post 08 Nov 2005, 21:27
h(100)+1 = (2.4.6...100)+1 = 2(1.2.3...50)+1
All prime factors less than 50 will yield a remainder of 1. So nothing less than 50 is a factor of this. Hence E.

Hey laxie, is that you in the picture? :wink:
How were you able to upload something from outside this site? I keep getting errors when I try to do it :(
SVP
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 [#permalink] New post 08 Nov 2005, 21:40
gsr wrote:

Hey laxie, is that you in the picture? :wink:
How were you able to upload something from outside this site? I keep getting errors when I try to do it :(


ah, i encountered the same error when trying to upload pix too ...guess what, I tried putting the link/ URL in the off-site fill-in place and it WORKED ...you may try it out~!! :wink:
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~
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Joined: 28 Dec 2004
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Location: New York City
Schools: Wharton'11 HBS'12
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 [#permalink] New post 08 Nov 2005, 21:43
hmm...whats with this shady chocolate business???

where is my sugga candy?

laxieqv wrote:
gsr wrote:

Hey laxie, is that you in the picture? :wink:
How were you able to upload something from outside this site? I keep getting errors when I try to do it :(


ah, i encountered the same error when trying to upload pix too ...guess what, I tried putting the link/ URL in the off-site fill-in place and it WORKED ...you may try it out~!! :wink:
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~
Director
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Joined: 21 Aug 2005
Posts: 795
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Kudos [?]: 7 [0], given: 0

 [#permalink] New post 08 Nov 2005, 21:45
laxieqv wrote:
gsr wrote:
ah, i encountered the same error when trying to upload pix too ...guess what, I tried putting the link/ URL in the off-site fill-in place and it WORKED ...you may try it out~!! :wink:
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~


1. Can you please explain the upload more in detail.
2. "guess whether it's me" The answer to this DS question is E. Insufficient data. So, I got it right!! Where are my chocolates?! :P
SVP
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 [#permalink] New post 08 Nov 2005, 22:03
ok, i captured a pic for you to see it clearly :wink: ...eager to see your new avatars :roll:
well, did i say it's a DS question?!! :P ..it's a problem solving ..so of coz , no data provided :roll:
SVP
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Joined: 24 Sep 2005
Posts: 1898
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 [#permalink] New post 08 Nov 2005, 22:04
ok, i captured a pic for you to see it clearly :wink: ...eager to see your new avatars :roll:
well, did i say it's a DS question?!! :P ..it's a problem solving ..so of coz , no data provided :roll:
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Director
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 [#permalink] New post 08 Nov 2005, 22:07
Cool, Laxie! I'am too tired now. Eyes are begging me to turn away from the monitor - been staring at this for 12 hours straight!
See you tomorrow with my new Avtar and will collect my chocolates/candies!
  [#permalink] 08 Nov 2005, 22:07
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crazy integer multiplication

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