- Messages
- 98
- Reaction score
- 86
- Points
- 28
so much anger
a) keep one boy and one girl as one unit you will have 8 blocks left which can change places hence 8!
and then boy and girl can also change place hence 2!
multiply 8! x 2!
b) take one side as noy and other as girl
only one boy can be at one side hence 4C1 and on side one girl 5C1
and then take factorial of children left makes
4 x5 x 7!
I think I read the question of a) wrongly
But why do we take one side boy and one side girl? I thought both sides should be same gender?