According to the question,

A ∪ B = A ∪ C

And,

A ∩ B = A ∩ C

To show,

B = C

Let us assume,

x ∈ B

So,

x ∈ A ∪ B

x ∈ A ∪ C

Hence,

x ∈ A or x ∈ C

When x ∈ A, then,

x ∈ B

x ∈ A ∩ B

As, A ∩ B = A ∩ C

So, x ∈ A ∩ C

x ∈ A or x ∈ C

x ∈ C

B ⊂ C

Similarly, it can be shown that C ⊂ B

Hence, B = C

Answered by Pragya Singh | 1 year agoFind the symmetric difference A Δ B, when A = {1, 2, 3} and B = {3, 4, 5}.