Question

a) how many numbers of subsets are there in the set {1,{2}}
b) write all those subsets of the above set

Answer 1

Answer:

( ), Denoted as the empty or null set

(1), Denoted as the set containing 1

(2), Denoted as the set containing 2

(1,2), Denoted as the set containing both 1 and 2, or the original set in the question.