This is a multiple choice question and the answers are:
A ∪ B = {7}
B ⊆ B
B ⊂ A
Only answer if your 100% sure, so no guessing please 🙂
6 Answers

The second choice is the correct one.
Specifically, the first answer is wrong because the union of sets A and B would be {3, 4, 5, 7, 9, 10, 13, 17}.
The third answer is wrong because B is not a subset of A – there are elements in B that are not also in A.
The second answer is, in fact, true by default, because for *any* set B, B ⊆ B (in other words, every set is its own subset).
Hope that helps!

second one is always true. A set is always its own subset.
just for sanity’s sake…
first one is false: the union of A and B is not {7}
third one is false: B is not a subset of A because A does not contain 3,5, and 9.

This question is impossible to answer without guessing because your multuple choices are unclear.
But if choice one is A intersect B, then that choice is correct.

A âª B = {7} is false
B â A is false
B â B is always true

A U B is not equal to {7} so, FALSE
B is a subset os B, so TRUE
B is not a subset of A, so FALSE

The middle one is the answer.
B is included and equal to B.