The sets {a, b, c} and {x, y, z} are

1. overlapping sets
2. equal sets
3. singleton sets
4. equivalent sets

A = {x : x is a prime number} and B = {x : x is an even natural number}. Then A ∩ B is

1. an empty set
2. a singleton set
3. an infinite set
4. equal to A

If X = {x : x is a multiple of 5} and Y = {x : x is a multiple of 7}, then X ∩ Y is

1. Φ
2. {x : x is a multiple of 2}
3. {5, 7}
4. {x : x is a multiple of 35}

{Φ} is a / an

1. empty set
2. infinite set
3. singleton set
4. universal set