
### Instruction: help me answer this question If X and Y are two sets, such that n(X) = 17, n(Y) = 23 and n(X ∪ Y) = 38, find n(X ∩ Y)., think step by step
### Assistant: Using the formula n(X ∪ Y) = n(X) + n(Y) – n(X ∩ Y) , we find n(X ∩ Y) = 2 , The answer is n(X ∩ Y) = 2
