Correct Answer - Option 3 : Both 1 and 2
Concept:
Equivalent set: When two sets, for example, A and B have the same cardinality if there exists an objective function from set A to B are called Equivalent set, i.e n(A) = n(B).
Equal set: Two sets for example A and B can be equal only if each element of set A is also the element of the set B. If two sets are the subsets of each other, they are said to be equal. So, it can be written as,
A = B
A ⊂ B and B ⊂ A ⟺ A = B
Calculation:
From the definition of equivalent and equal set we can see that;
Statement 1 is true because the number of elements in A = Number of elements in B = 3
Statement 2 is true because {1, 5, 9} ∈ A and {1, 5, 9} ∈ B