**Intersection meaning in two set:**

**common element** in the set A and B is called** intersection** or same element in the **set A** **and B** is called** intersection**, intersection in math denoted by symbol** ∩**

**Intersection diagram in two set**

**Example of intersection meaning in two set**

If we have set A = {1, 3, 6, 9} and set B= {2, 3, 7, 9}

**SOLUTION:**

**A ∩ B**= {1, 3, 6, 9} ∩ {2, 3, 7, 9}

**A ∩ B**= {3, 9} is the intersection of set A and B.

**Intersection of PHY set. φ , Or null set**

**Set A = {} = φ and set B = {1,6,9,10}**

**A ∩ B = {} ** ∩ {1,6,9,10}

**A ∩ B = {} = φ**

**Intersection of same set**

if we have set

**A = {1,2,3,4,5,6} and set B = {1,2,3,4,5,6}**

A ∩ B = {1,2,3,4,5,6} ∩ {1,2,3,4,5,6}

SO

**A ∩ B = {1,2,3,4,5,6}**

the result prove that when set A and Set B have number

(1) A ∩ B = A

(2) A ∩ B = B

**We can write position set 1 and 2**

(i) A ⊆ A ∩ B

(ii) B ⊆ A ∩ B

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