One-third hypothesis the cohesiveness of the group that is one-third. According to the binomial coefficient a group of size r occurs in a population of size n in formula_1 ways. Because each group of size r can dissolve in "2" subgroups, the total number of ways all groups of size r can emerge and dissolve equals "3", in keeping with the summation: formula_2 Said otherwise, large groups close to two-thirds of the population will be more likely than any other groups to dissolve into splinter groups. A corollary of this consideration is that much smaller groups will be the ones most likely
Divided family also be divided if national boundaries remain unchanged, but instead groups of people or invidviduals are moved, forced to leave or flee. Forced displacement such as flight from persecution, violence or a severe lack of public order can be causes of divided families. For example, over 100,000 unaccompanied minors applied for asylum in other countries in 2015. Other examples are population transfer, third country resettlement and deportation. Many countries offer programmes for family reunification that allows divided families to live together again. The division of the Korean peninsula is one of the last remaining relics of the Cold War. Since