A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
Number of arrangements of the set \(\{a_1,a_2, \ldots, a_{10}\}\), so that \(a_1\) is always ranked above \(a_2\).
anonymous
 4 years ago
Number of arrangements of the set \(\{a_1,a_2, \ldots, a_{10}\}\), so that \(a_1\) is always ranked above \(a_2\).

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0@satellite73 @eliassaab

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0dunno i hate counting but if \(a_1\) is first then there are 9 choices for \(a_2\) if \(a_1\) is second there are 8, if \(a_1\) is third there are 7, so i guess we can use that

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0without thinking too hard i get an answer that could easily be wrong, namely \[9+8+7+6+5+4+3+2\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oops +1 at the end because \(a_1\) could be 9th leaving one possibility for \(a_2\)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh crap that is all wrong

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0but idea is probably right. if \(a_1\) is first there are 9! arrangements

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1I think it could be 1(9+8+7+6+5+4+3+2+1)8!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0if \(a_1\) is second there are 8 times 8! arrangements

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1dw:1340650357123:dw

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so yeah, experimentX has it

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0experimentx's makes sense. and so does satellite's idea. Medal each other.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0experiemntx's answer*

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0that answer makes sense to me. i was totally wrong the first time, and didn't know that formula but now that i see it it is clear

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1well that solves it ;)
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.