Question

If A = {positive integers} and B = {…,−4, −3, −2, −1} what is A ∩ B?

{ }

{…, −3, −2, −1, 1, 2, 3, …}

{1, 2, 3, 4, …}

{…−3, −2, −1}

Answer 1

Hint: Another way to think about intersection is to ask yourself, "Which numbers are in both sets?".

Answer 2

hmmm

Answer 3

help?

Answer 4

2nd Hint:

A = {1,2,3,4...}
B = {...-4,-3,-2,-1}

Do these two sets have any chance of intersecting?

Answer 5

no?

Answer 6

Correct, but you don't seem too confident about your answer.