In a display window, a grocer wishes to put a row of fifteen cans of soup consisting of five identical cans of tomato soup, four identical cans of mushroom soup, three identical cans of celery soup, and three identical cans of vegetable soup.
A.) How many displays have a can of tomato soup at each end?
B.) How many displays have a can of the same kind of soup at each end?

- anonymous

- jamiebookeater

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- mayankdevnani

fifteen cans of soup consisting of five identical cans of tomato soup, so each end consists 15/5=?????
can you solve it @marceloronniel

- anonymous

I still have no idea at all

- mayankdevnani

divide 15/3 to get 1 each end...ok

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## More answers

- anonymous

huh?

- mayankdevnani

@AravindG can you explain it what am i saying to marce

- mayankdevnani

15/3=?? what is the answer

- mayankdevnani

can you divide 15 by 3 @marceloronniel

- anonymous

yes.....there is no problem about that, i only long here for the explanation but thanks anyway :)

- mayankdevnani

hey!!!!! lol

- kropot72

Having fixed a can of tomato soup at each end of the display, there are then 3 identical cans of tomato soup, 4 identical cans of mushroom soup, 3 identical cans of celery soup and 3 identical cans of vegetable soup to rearrange in permutations.
The total number of permutations of these 13 cans is given by the following:
\[\frac{13!}{3!4!3!3!}\]
13! must be divided by the number of ways the available number of identical cans of each variety of soup can be arranged without making a different display.

- chihiroasleaf

this problem is similar to the problem,
'how many different ways can you arrange the letters in the word 'MISSISSIPPI' ?'
have you learned about this topic? :)

- anonymous

I only learned about the simple easy problems involving permutations with repititions...I have no idea about them when it involve twists... sadly :(

- chihiroasleaf

for example.., if I have words \[AAB\]
first.., assume that we distinguish the letters A, I'll use subscript
\[A _{1}A _{2}B\]
the number of ways to arrange this letter is 3! (using permutation)
Now, the number of ways to arrange the letter \[A _{1}A _{2}\] is 2!
so.., if we assume that the letter 'A' is indistinguishable
the number of ways to arrange the letters 'AAB' will be
\[\frac{ 3! }{2! }\]
can you get it so far?

- anonymous

Yes that's where i have been familiar

- chihiroasleaf

so.., in general if we have n objects with \[n _{1}\] of the first type, \[n _{1}\] of the second type, and \[n _{1}\] of the r-th type , with \[n _{1} + n_{2} + .... + n_{r} = n \] ,
then the number of arrangement is \[\frac{ n! }{n _{1}! n _{2}! .... n _{r} !}\]
you should have been familiar with this, right?

- anonymous

yeah

- chihiroasleaf

now.., let's look at your problem...
you have 15 in totals.., with 5 identical cans of tomato soup, 4 identical cans of mushroom soup, 3 identical cans of celery soup and 3 identical cans of vegetable soup
Your first problem
"How many displays have a can of tomato soup at each end?"
you have 5 cans of tomato.., if at the end of the rows must be the tomato.., how many cans of tomato soup left?
T_ _ _ _ _ _ _ _ _ _ _ _ _ T
the first can and the last can in the row must be tomato (I used the letter T)
so.., what cans you should arrange in the middle?

- AravindG

@mayankdevnani sorry bro I was not here at that time ..seems @chihiroasleaf has everything in control now :)

- anonymous

the remaining 13 cans.........

- chihiroasleaf

yes...
and what are they?

- anonymous

3 cans of tomato, four cans of mushroom 3 cans of celery 3 cans of vegetable

- chihiroasleaf

yup..,
so you have 13 cans with 3 cans of tomato, 4 cans of mushroom, 3 cans of celery, and 3 cans of vegetable..,
now.., how many ways can you arrange this 13 cans? :)

- anonymous

1 201 200 ways???????

- chihiroasleaf

I don't count it yet...,
how do you find it? :)
in factorial notation?

- anonymous

I saw the way kropot72 did it err

- chihiroasleaf

ok..,
it's correct... :)
do you get it now?

- anonymous

how about letter b? even only the visualization.......

- anonymous

pleeease!!!! ty

- chihiroasleaf

the question is
'How many displays have a can of the same kind of soup at each end?'
you have can of tomato(T), mushroom(M), celery (C), and vegetable (V)
can you list the possibility of row with the same kind of soup at each end?
for example :
T _ _ _ _ _ _ _ _ _ _ _ _ _ T
can you list the others?

- anonymous

so you're pointing out for mo to just multiply my answer by 4?

- chihiroasleaf

no.., it's adding not multiply...

- chihiroasleaf

so.., you have to find the number of ways at each possibility and add the result..
the sum will be the answer..

- anonymous

hahaha i'm i don't mean it ...was just excited to finish my task...

- anonymous

I got it...thank you without you...i'm lost.....:)

- chihiroasleaf

you're very welcome... :)
good luck

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