The total number of subsets of {A, B, C} is?

If the number of elements in a set is n, then there will be 2^n number of subsets.

For every set, the empty set {} is a subset as well as the full set.

So the subsets are { }, {A}, {B}, {C}, {A,B}, {A,C}, {B,C}, and {A,B,C}.

If the question is "find the number of proper subsets", then don't include the full set. 

The subsets are 

Φ  (i.e. the empty set)

{A}, {B}, {C}

{A,B}, {A,C}, {B, C}