Introduction to Sets

A well-defined collection of distinct objects having a common property is called a

• Group

• Team

• Set

• I don't know

Object/s in a set

• Element

• Item

• A person

• A thing

The set of all whole numbers is not a well-defined set?

• True
• False

We use lower case letters to name a set.

• True

• False

∊

• E

• 'is not an element

• 'is an element

• 'the number of elements of'

A = {2, 5, 6}. Find n(A)

• 2
• 3
• 4
• 1

C = {1, 6}. Is 1 ∈ or ∉ C?

• ∈
• ∉

1. What type of set is denoted as either { } or ∅?

• Superset

• Finite Set

• Empty (or Null) Set

• Infinite

Find n(A) when

A = {14, 16, 18, 20, 22, 24}

• 6

• 4

• 12

• even natural numbers

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 }