Set Theory Quiz 2.1-2.4

What is a Set?

• It has a limited number of elements.

• Two sets which have the same members.

• It is a collection of well-defined objects or elements.

• It has no element present in it.

Set Q contains the letters in the word SISTER .

Which of the following is set Q ?

• Q = { S, T, R }

• Q = { I, E }

• Q = { S, I, S, T, E, R }

• Q = { S, I, T, E, R }

Answer explanation

Elements in a set should NEVER appear more than once.

Express the set using the roster method. 'The set of months of the year that start with the letter J.'

• J = {January, June, July}

• J = {February, June}

• J = {January, June}

• J = { June, July}

Which of the following is the symbol for null set?

• ∅

Which of the following is the symbol for "element of"?

• ∅

The Cardinality is the number of elements in a set.

• true

• false

Find n(B) = {-3, -1, 1, 3, 5, 7}

• a. 2

• b. 4

• c. 6

• d. 8

Find n(C) = { }

• a. 2

• b. 4

• c. 6

• d. 0

List the elements of A

• {2,3}

• {2,3,5,9}

• {1,2,3,4,5}

• {5,9}

List the elements of A Ո B

• {5,9}

• {2,3,7,6,8}

• {2,3,5,9,7,6,8}

• {1,4}