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Principal Of Inclusion
& Exclusion
By Vishal Maher
1
Welcome To This Tutorial,
In This Tutorial We Will Be Discuss
About Principal Of Inclusion &
Exclusion
2
Cardinality Of Set
3
Cardinality Of Set
 Number of elements present in a set
A = {a, b, c, d, e}
|A|= 5
 And it is denoted by |A|
4
Operations On Two Set
|A∪B| = |A| + |B| - |A∩B|
5
Ex.
Let A={a, b, c, d, e} and
B={c, e, f, h, k, m} find |A∪B| using Inclusion & Exclusion
Principle of two set
A∪B={a, b, c, d, e, f, h, k, m}
|A ∪B|=9
A ∩B={c, e}
|A ∩B|=2
|A|=5
|B|=6
|A ∪B|=|A|+|B|-|A ∩B|
9=5+6-2
9=11-2
9=9
This Is The Proof Of This Principle
6
Ex.
A company want to hire 25 programmers to handle system programing job & 40 Programmers
for application program, of those hire 10 will be expected to perform job of both types. How
many programmer be hire by the company?
Let A is set of system Programmers & B is set of application programmers
|A|=25
|B|=40
|A ∩B|=10
|A ∪B| =|A|+|B|-|A ∩B|
=25+40-10
=65-10
|A ∪B| =55
 55 Programmers are to be hired by the company
7
Thank You
8

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Principal of inclusion & exclusion for two sets by vishal maher

  • 1. Principal Of Inclusion & Exclusion By Vishal Maher 1
  • 2. Welcome To This Tutorial, In This Tutorial We Will Be Discuss About Principal Of Inclusion & Exclusion 2
  • 4. Cardinality Of Set  Number of elements present in a set A = {a, b, c, d, e} |A|= 5  And it is denoted by |A| 4
  • 5. Operations On Two Set |A∪B| = |A| + |B| - |A∩B| 5
  • 6. Ex. Let A={a, b, c, d, e} and B={c, e, f, h, k, m} find |A∪B| using Inclusion & Exclusion Principle of two set A∪B={a, b, c, d, e, f, h, k, m} |A ∪B|=9 A ∩B={c, e} |A ∩B|=2 |A|=5 |B|=6 |A ∪B|=|A|+|B|-|A ∩B| 9=5+6-2 9=11-2 9=9 This Is The Proof Of This Principle 6
  • 7. Ex. A company want to hire 25 programmers to handle system programing job & 40 Programmers for application program, of those hire 10 will be expected to perform job of both types. How many programmer be hire by the company? Let A is set of system Programmers & B is set of application programmers |A|=25 |B|=40 |A ∩B|=10 |A ∪B| =|A|+|B|-|A ∩B| =25+40-10 =65-10 |A ∪B| =55  55 Programmers are to be hired by the company 7