# Let a = {15, 25, 35, 45, 55, 65} and b = {25, 45, 65}. what is a ∩ b?

**Solution:**

In set theory, for any two sets A and B, the intersection is defined as the set of all the elements in set A that are also present in set B.

We use the symbol '∩' that denotes 'intersection of'.

Intersection of two sets refers to the set of items that are present in both a and b.

a = {15, 25, 35, 45, 55, 65}

b = {25, 45, 65}

In both sets the common items are

a ∩ b = {25, 45, 65}

Therefore, a ∩ b is {25, 45, 65}.

## Let a = {15, 25, 35, 45, 55, 65} and b = {25, 45, 65}. what is a ∩ b?

**Summary:**

Let a = {15, 25, 35, 45, 55, 65} and b = {25, 45, 65}. a ∩ b is {25, 45, 65}. Intersection of two sets refers to the set of items that are present in both a and b.

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