1. MEDIUM

A number's factors, excluding the number itself, are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, __ . What is the last factor?

 
2. MEDIUM

What are the factors of 87?

  1. 1, 87
  2. 87, 1
  3. 1, 3, 27, 87
  4. 1, 3, 29, 87
  5. None of the above
 
3. MEDIUM

What is the product of the all factors of 12?