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|dw:1442401794759:dw|

:O

is it 7!*7!

|dw:1442401981845:dw|

I guess it is (7-1)!*7!
according to the diagram you have given

but the question says 2 boys and 2 girls alternatively?

yes in book it is 6!*7!

my bad..... ! I didn't read the question properly, it says no two boys and girls.....

how does (7-1)! comes ?

but by that logic it should be =(7-1)!*(7-1)!=6!*6!

hmmm.....
no no

You can think of it this way
|dw:1442402619890:dw|

A boy chooses any of the 14 seats, and it won't change anything because of rotation.

Then there are 6! to seat the boys.

The girls sit between the boys, so 7!

thats a total of 6! 7!

|dw:1442402759464:dw|
just assisting :D

ok thnks all

no prblm hehe :D

that is 6! * 7! total

|dw:1442403160561:dw|

suppose their were 3 persons then ?

|dw:1442403194062:dw|

|dw:1442403195959:dw|

and what are the conditions ?
like a cant sit with b or c or something like that?

oh 3 boys and 3 girls

no boy, girl ,alien

alien...lmao

3 boys
3 girls
3 aliens
no 2 boys, no 2 girls, no 2 aliens sit next each other?

ya this one ^

will it be 3!*3!*2!

3!*3!*2!

|dw:1442403829346:dw|

|dw:1442403873463:dw|

when you start placing girls, you have more choices

3!3!6!

|dw:1442403928373:dw|

or the number of ways to rearrange xxx g1 g2 g3 is 6! / (3! * 1!*1! *1!)

I get 1440

'x' stands for a space a girl will not land in , its blank

how u get this
"6*5*4".

you saw how i placed the aliens, the boys, then we have left the girls

|dw:1442404331340:dw|

|dw:1442404352769:dw|

|dw:1442404370104:dw|

|dw:1442404420852:dw|

what is "x" in ur diagram

those are blank spaces, the girls do not land in them . but they are important in the configuration

the girls can switch places with the x's

ok i get it now

then the question is how many ways to rearrange
g1 g2 g3 x x x

these*

yep i agree

thats why they are Counting questions

|dw:1442404776805:dw|this is imquerty

lol

how do u make such drawings :D

with tool extension

works in chrome

this is that tool ^

;-; i will fix it after 2 weeks :( till then i hav to use the old tool ;-;

lol it works instantly

this is how math gets deeper and deeper

:)

this is hard wont come in ma exam

this can be a research problem :)

we have done some base cases

yea not for inocents like me

:D

|dw:1442405691978:dw|

Thank you for using the OpenStudy Notebook extension.

welcome

|dw:1442406626294:dw|

can you guys give me the extension link?

The one i attached before will work