This is a problem that has haunted me for some time
There is two family. First Family :
Husband : Adam Wife : Barbie Son1 : Caran Son2 : Dave Daughter1 : Emily Daughter2 : Fiona
Second Family :
Husband : George Wife : Honey Son1 : Ian Son2 : Jack Daughter1 : Kate Daughter2 : Laura
One day, Adam is in love with Honey and George is in love with Barbie. Now, everyone decide to divorce his/her partner. Then, Barbie married to George and Adam married to Honey. Both new couple decided to keep 4 children having two girl and two boy. And, Every parent keep his/her own two children.
What is the combination for 4 children having two boy and two girl and two of childrens are from one of his/her parent?
It may be two boy from one parent, two girls from another. Or It may be 1 boy and 1 girl from one parent, one boy and one girl from his/her partner.
Sorry for bad english.