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a is correct
b think again
c wrong

oh i see...

how about part c then?

Errr, how can you tie all boys in one bag if all boys must sit separately in part b?

i understand your point. but i am still confusing part b and c...

Which part(s) are you confused at?

b and c

I mean what..

why tie in a bag is wrong?

oh yes.

Clear?

clear. so what should we do in this case?

i mean, what should be the correct working step?

Read above comments

i cannot understand 6 x.

That's part c,right?

i got part b now. and go on to part c

Those x's are either boys or girls.

oh, i made it as (8-1)!*2! ...
understand now...i forgot 2 girls must sit at the ends....

:)