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# crazy integer multiplication

Author Message
Manager
Joined: 19 Sep 2005
Posts: 110

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08 Nov 2005, 22:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
Joined: 24 Sep 2005
Posts: 1885

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08 Nov 2005, 22:17
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
Joined: 21 Aug 2005
Posts: 790

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08 Nov 2005, 22:27
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?
How were you able to upload something from outside this site? I keep getting errors when I try to do it
SVP
Joined: 24 Sep 2005
Posts: 1885

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08 Nov 2005, 22:40
gsr wrote:

Hey laxie, is that you in the picture?
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~!!
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~
Current Student
Joined: 28 Dec 2004
Posts: 3357
Location: New York City
Schools: Wharton'11 HBS'12

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08 Nov 2005, 22:43

where is my sugga candy?

laxieqv wrote:
gsr wrote:

Hey laxie, is that you in the picture?
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~!!
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~
Director
Joined: 21 Aug 2005
Posts: 790

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08 Nov 2005, 22:45
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~!!
Uhm, guess whether it's me ...if you answer correctly ..i'll reward you a piece of chocolates ^_~

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?!
SVP
Joined: 24 Sep 2005
Posts: 1885

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08 Nov 2005, 23:03
ok, i captured a pic for you to see it clearly ...eager to see your new avatars
well, did i say it's a DS question?!! ..it's a problem solving ..so of coz , no data provided
SVP
Joined: 24 Sep 2005
Posts: 1885

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08 Nov 2005, 23:04
ok, i captured a pic for you to see it clearly ...eager to see your new avatars
well, did i say it's a DS question?!! ..it's a problem solving ..so of coz , no data provided
Attachments

guide.doc [25.5 KiB]

Director
Joined: 21 Aug 2005
Posts: 790

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08 Nov 2005, 23:07
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!
08 Nov 2005, 23:07
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