UPSKILL MATH PLUS

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1. From the adjacent diagram \(n[P(A \Delta B)]\) is
 
A_27_new.png
 
2. If \(X = \{x : x = 4(n – 1), n \in \mathbb{N}\}\) and \(Y = \{y : y = 3^n – 2n – 1, n \in \mathbb{N}\}\), then \(X \cup Y\) is
 
3. Let \(A = \{\phi\}\) and \(B = P(A)\) then \(A \cap B\) is