I and II
I and III
II and III
I, II and III
Correct answer is A
If S ⊂ T ⊂ W,
S ∩ T ∩ W = S is true since S ∩ T = S and S ∩ W = S.
S ∪ T ∪ W = W is also true. S ∪ T = T and T ∪ W = W.
However, to say that T ∩ W = S is not very true mathematically. Instead, it is safe to say S ⊂ (T ∩ W).
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