What is the potentiality be of {{a, b}, {c}}

potentiality be of {(a,b),+{c}} is 8

I conciliate furnish you the combinations { },{ a},{ b},{ c},{ a,b},{ a,c},{ b,c},{ a,b,c}….

In open we can specify the controlmula control potentiality be is 2 potentiality of no of elements

if elements are 3, then 2potentiality 3 is 8 and if elements are 4 ,2potentiality 4 16…..