Perms and Combs. (1 Viewer)

[theind1996]

Refer to my post about placement of commas.

Kekekeke

 

[RivalryofTroll]

A meeting room contains a round table surrounded by ten chairs.
These chairs are indistinguishable and equally spaced around the table.

(a) A committe of 10 people incl. 3 teens. How many arrangements are there in which all 3 sit together? 30240

(b) Elections are held for the positions of Chairperson and Secretary in a 2nd committee of ten people seating around this table. How many seating arrangements are there in which two people elected are sitting directly opp. to each other?

Is (b) just 8!
?

 

[Deliriously]

I always did it that way got the right answer so I assumed what I did was right.
and yes, I agree its ambiguous ><

 

[RivalryofTroll]

English... haunts you to this day.

Only in perms and combs

 

[Deliriously]

Is (b) just 8!
?

yep!

 

[theind1996]

Is (b) just 8!
?

Can you explain pl0x?

 

[Deliriously]

If rivaly doesn't mind!

I assigned one of the elected members as my fixed point. 1x
other member must only have 1 seat (opposite to him) 1x1
Other 8 people fill in the rest of the seats 1x1x8! = 8!

I'm going to sleep nows ! =) GL

 

[theind1996]

If rivaly doesn't mind!

I assigned one of the elected members as my fixed point. 1x
other member must only have 1 seat (opposite to him) 1x1
Other 8 people fill in the rest of the seats 1x1x8! = 8!

I'm going to sleep nows ! =) GL

Oh haha - it's pretty simple - thanks a lot

Good night - Ima get some sleep too!

 

[RealiseNothing]

A committee of 6 is to be selected from 10 people of whom A and B are two. How many committees can be formed excluding A if B is included?

Terrible, terrible question.

(so ambiguous).

 

[Shadowdude]

Did none of you people listen to my #1 tip in doing these questions:

SET OUT YOUR WORKING CLEARLY

still i see seemingly non-sensical strings of C(n,k)r!s!t!P(q,u) which confuses everyone <_<


or did none of you go to my lectures