Types of Sets

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 A Which of the following sets are empty,
         unit, finite or infinite?       

1.  { counting number less than 1}
2.  { even numbers divisible by 3}
3.  { a, b, c, ......u}
4.  {letters in the word "CLASS"}
5.  {x:x is a whole number, x<1}
6.  {prime numbers between 5 and 7}
7.  {multiples of 5}
8.  {even prime numbers}
9.  {composite numbers less than 100}
10.  { }