Question

Find total number of subsets of B = {a, b, c}

Answer 1

Any set $B$ is a subset of a set $A$ if $A$ contains all the elements of $B$.
Hence, all the Subsets of $B$ are $\varphi ,\left\{a\right\},\left\{b\right\},\left\{c\right\},\{a,b\},\{a,c\},\{b,c\},\{a,b,c\}$.