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WORKBOOK

Example 7: The sum of number of subsets of a set A and the number of proper subsets of A is 127. Find the
number of element of set A.

Example 8: When the number of elements of a set A is increased by 2, the number of
subsets of A is increased by 192. Find n(A).

Work hard in silence, let your success be your noise.

EXERCISES 2

1) Let A = {1, 2, 3}. Write all the subsets of this 3) If A= {0, 1, {2}, {2, 3, 4}, {5, 6, 7}, 8}, then
set. determine whether the following
statements TRUE or FALSE.
( ) {2}∉A

( ) {2}⊂A
( ) {3, 4} ∈A

( ) {0, 1}⊂A
2) A   b,a ,    e,d,c is a given set. Which of the ( ) {{5, 6, 7}, 8}⊂A
following is false? ( ) ∅ ∈A
( ) a ÎA
( ) ∅ ⊂A
( ) {a,b} Ì A ( ) n(A) = 6

{
( ) {c,d}} Ì A 4) If the number of elements in a set is

increased by 2, then the number of subsets
( ) {e,a} Ì A increases by 48. Find the number of the

subsets?
A
b, c
( )   

15 091math-wb-w3-(sets)