Page 14 - 091math-wb-w3-(sets)

WORKBOOK

ACTIVITY:

Fill in the table given below.

Number

Set of Element/s Subsets Number of Subsets

A = ∅ n (A)=0 ∅ 1 2 0

B = {1} n (B)=1 ∅,{1} 2 2 1

C = {1,2} n (C)=……. ∅, ……………………………………….. 4 2 2

D = {1,2,3} n (D)=…… …........................................... …….. ……….

• Number of subsets: The number of subsets of a set with n element is:…………..

• All subsets of a set except itself is called ………………………..

• Number of proper subsets: The number of proper subsets of a set with n element is:…………..

Example 5: Find the number of subsets of the given sets

a) A = {a,b,c, d,e}

Empty set has

only one
b) B = {x |x < −2,x ∈ N} subset.

c) C = {x| − 1 ≤ x < 3, ∈ Z}

Example 6: Given that B   ,1, 3, 4, ,9  . Find the number of subsets and proper subsets of B.

14 091math-wb-w3-(sets)