The number of sets X, such that X is a subset of A, and X is not a subset of - Maths - Quadratic Equations

Question

The number of sets X, such that X is a subset of A, and X is not a
subset of B, where, A={a, b, c, d, e}, B={c, d}

Brijendra Pal · Accepted Answer

Hi, Given X is subset of A but not subset of B meaning element of X are in A but not in B so X can be  or ϕ, a,b,e, a,b,e,a,b,b,eso there are 7 possibilities

The number of sets X, such that X is a subset of A, and X is not a subset of B, where, A={a, b, c, d, e}, B={c, d}