If S and T are two sets such that S has 21 elements

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If S and T are two sets such that S has 21 elements, T has 32 elements, and S ∩ T has 11 elements, how many elements does S ∪ T have?
13
Oct
If S and T are two sets such that S has 21 elements, T has 32 elements, and S ∩ T has 11 elements, how many elements does S ∪ T have? and S ∩ T has 11 elements how many elements does S ∪ T have? If S and T are two sets such [...]
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