Answer:
The correct option is 4.
Step-by-step explanation:
The given mathematical expression is
9 ∉ T
The meaning of mathematical signs are
∉ → means does not belongs to
∈ → belongs to
∪ → Union
∩ → Intersection
1. 9 union T is written as 9 ∪ T.
2.9 intersection T is written as 9 ∩ T.
3. 9 is an element of T is written as 9 ∈ T.
4. 9 is not an element of T is written as 9 ∉ T.
Therefore option 4 is correct.
