Which of the following is a finite set?

1. Set of all natural numbers greater than 500.
2. Set of all integers less than 5.
3. Set of all even prime numbers.
4. Set of all multiples of 3.

Which of the following is a pair of disjoint sets?

1. A = {even natural numbers} and B = {prime numbers}
2. C = {multiples of 2} and D = {multiples of 3}
3. E = {factors of 24} and F = {factors of 9}
4. G = {letters in the word 'RHYTHM'} and H = {Vowels in English Alphabet}

The number of proper subsets of the set {α, β, Φ, θ, η} is

1. 24
2. 25
3. 31
4. 32

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

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