Question

give any two example for subset and proper subset , joint & disjoint

Answer 1

Subset and Proper subset -

For example, if A={1,3,5} then B={1,5} is a proper subset of A. The set C={1,3,5} is a subset of A, but it is not a proper subset of A since C=A. The set D={1,4} is not even a subset of A, since 4 is not an element of A.

Disjoint sets -

Two sets are said to be disjoint sets if they have no element in common. Equivalently, two disjoint sets are sets whose intersection is the empty set.

For example, {1, 2, 3} and {4, 5, 6} are disjoint because no element is common ,

while {1, 2, 3} and {3, 4, 5} are not disjoint because 3 is common