Perform the indicated operations and simplify the expression. 
Definitions:
Group Size
The number of individuals participating in a social group or gathering, affecting its dynamics and interactions.
Group Dynamics
The study of the behaviors and psychological processes occurring within a social group, or the effects the group has on individual behavior.
In-Groups
Social groups to which an individual feels they belong, where members often share similar interests or identities.
Out-Groups
Groups to which individuals do not belong and may feel opposition or hostility towards, in contrast to in-groups with which they identify.
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