Question

the set [1,2,3,4,...] is denoted by ​

Answer 1

Answer:

Definition: A set is a collection of objects. The objects belonging to the set are called the elements of the set. Sets are commonly denoted with a capital letter, such as S = {1, 2, 3, 4}. The set containing no elements is called the empty set (or null set) and is denoted by { } or ∅.

please mark as brainliest

Answer 2

Answer:

rational numbers I think so