A. State: whether each of the following sets is well-defined or not

1. The set of all factors of 18. Well-Defined

• The factors of 18 are immediately obvious, these are 1, 2, 3, 6, 9 and 18.

2. The set of independent learners. Not Well-Defined

• The answer is not immediately obvious because you wouldn't be able to tell who in this world are independent learners.

3. The set of delicious food. Not Well-Defined

• The answer is not immediately obvious because there are tons of food all over the world, and you probably haven't tried most of them.

4. The set of letters in the word "pandemic". Well Defined

• The set of letters in the word pandemic are immediately obvious, these are p, a, n, d, e, m, i, c.

5. The set of candid students. ​Not Well-Defined

• The answer is not immediately obvious because you wouldn't be able to tell who in this world are candid students.