Question

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

1. { }

2. {…, −3, −2, −1, 1, 2, 3, …}

3. {1, 2, 3, 4, …}

4. {…−3, −2, −1}

Answer 1

1

Answer 2

Yes, it is 1

the sign means what is common b/w both sets and actually they have nothing in common