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View asa and bill as one person. Then, find the number of ways the four "people" can fill the seats. Then view bill and asa as one person, and do it again. Sum the two. Thats the total number of ways bill and asa can sit next to each other. Now, find the total number of ways the five students can sit in the row. The probability they sit next to each other is the the number of ways they can sit next to each other divided by the number of ways they can sit overall.
Note that order is important!
can u show the work?? lol
9 / 5!
8 / 5!
what? It's supposed to be a fraction
you have ABCDE , there are 5! ways of sitting them. that will be your denominator
the favorable is AB sitting together, you can have oh...
you can have AB, BA , and there are 4 places , so 4* 2
thats your numerator
what's the numerator?
so you have 8/120
that's not a choice though (1) 1/60 (2) 2/5 (3) 1/10 (4) 4/15
ok there are 2x4x3! in the numerator
wait 24/120 is 1/5 not 2/5
no thats 48/120
oh, I got u
2x4x3! = 2x4x(3x2x1)
give me medal NOW
I got 2/5.
there are 2 ways for AB to sit next to each other, they can move around in 4 different places, then there are 3! for the rest of the other people to sit
wait so basically it's 5!/ 2!4! ???
shut up omg. Look at the method i proposed. 2(4!)/(5!)
well you treat AB as K, so you have K C D E , and how many ways can you reararnge that
then K has 2! ways
shut up, omg, GROW UP
u 2 r arguing?
so you have K C D E , where K is AB, and you have 4! ways of rearranging that, but K is actually AB or BA, so 4! * 2!
azn, can you give me medal, i got answer first
can u guys explain what u did?
explain then right now
treat AB as K, since they always sit next to each other, so you have K C D E , correct ?
so how many ways to rearrange K C D E ?
right, but for each one of those arrangements, you have AB or BA
since they can swap
so you need 24 x 2
in other words, K can be AB or K can be BA
so you have 24 with AB , and 24 with BA, so 24 + 24
ok and how did u get the 5! part
thats the number of ways to rearrange A B C D E
wheres my medal
oh I got it
how do I give u a medal? It's my first time here, how?
next to my name
it should say give medal