This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.

csulapredental

Full Member
7+ Year Member
Joined
Jun 25, 2016
Messages
118
Reaction score
16
how many diff ways can 2 girls and 3 boys sit in a row if the 2 girls always sit side by side.
I'm trying to apply chads method but i can't tell how. clearly order matters and when order matters he just puts the number of selections on top and thats it because order matters... so it should be 5! but its not..


another one is how many ways can the same 4 physics books, 3 algebra books, and 2 chem books be arranged on a self.. again order matters so it should be 9! ??


i feel like his way isn't applying.
even if i use the equation of n!/(n-r)! there isn't a clear r to plug in!???

pelase help

Members don't see this ad.
 
Its been a while since I did these, but I think this is number 1. And the second one is done the same way. FYI, order matters here and there is no replacement (obviously), so you don't divide by anything.

Oh sorry, I thought it was 3 girls and 2 boys lol. It's late… and since the girls must always sit side by side…ya, didn't see that part either lol. Look at the second attachment.
 

Attachments

  • FullSizeRender.jpg
    FullSizeRender.jpg
    77.3 KB · Views: 38
  • IMG_4199.JPG
    IMG_4199.JPG
    107.9 KB · Views: 43
Last edited:
Its been a while since I did these, but I think this is number 1. And the second one is done the same way. FYI, order matters here and there is no replacement (obviously), so you don't divide by anything.

Oh sorry, I thought it was 3 girls and 2 boys lol. It's late… and since the girls must always sit side by side…ya, didn't see that part either lol. Look at the second attachment.
the answer is 48 tho
 
Members don't see this ad :)
wtf, are you seriously asking this question. this problem come directly from math destroyer. i know because i did this problem from math destroyer. go look at the answer on the back of the damn book and read the explanation. nobody going to walk you step by step with every damn problems.
 
Last edited:
wtf, are you seriously asking this question. this problem come directly from math destroyer because i know i did this problem from math destroyer. go look at the answer on the back of the damn book and read the explanation. nobody going to walk you step by step with every damn problems.
stop crying
the question refers to using CHADS METHOD SPECIFICALLY
obviously the answer is in the back but it was asked on here for a reason gtfo
 
you stupid as hell, you ask every damn questions on here expecting people to hold your hands on every little thing. why don't you gtfo here and actually study the damn material yourself.
 
you stupid as hell, you ask every damn questions on here expecting people to hold you hands on every little thing. why don't you gtfo here and actually study the damn material yourself.
why r u still speaking
 
Top