Question

Find the number of subsets and the number of proper subsets of the following set:

X = { x : x ∈ W , x ∉ N }

Answer 1

x belongs to W means it belongs to the set of natural numbers along with 0. but x doesn't belong to natural numbers. therefore x=0.therefore number of subsets=2 and no. of proper subsets=1.

Answer 2

NUMBER OF SUBSETS = 2
NUMBER OF PROPER SUBSETS = 1