A = {ϕ} is a/an ____ set.
The set A={x:x=n−1n, where nϵN} is a finite set.
B={x:x=3n+1, n∈N and n≤20} is a finite set.
The set B={x:x=3n+1, nϵN and n≤5} is a finite set.
The set B={x:x=3n+1, nϵN and n≤20} is a finite set.