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51). The number of subsets of an empty set is
 A). 0 B). 1 C). 2 D). 3
52). If $$\Large A=\{ 1, 2, 4, 5 \},\ B=\{ 1, 2, 3 \}$$ then A-B is
 A). $$\Large \{ 1, 16 \}$$ B). $$\Large \{ 1, 9 \}$$ C). $$\Large \{ 1, 3 \}$$ D). $$\Large \{ 1, 4 \}$$
53). Which of the results is not true?
 A). $$\Large A\cap \left(B\cup C\right)= \left(A\cap B\right)\cup \left(A\cap C\right)$$ B). $$\Large A\cup \left(B\cap C\right)= \left(A\cup B\right)\cap \left(A\cup C\right)$$ C). $$\Large A\cup \left(B\cup C\right)= \left(A\cup B\right)\cup C$$ D). $$\Large A\cap \left(B\cup C\right)= \left(A\cup B\right)\cap \left(A\cup C\right)$$
54). if $$\Large n\left[ p \left(A\right) \right]=64$$, then $$\Large n \left(A\right)=?$$
 A). 4 B). 6 C). 8 D). 16
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