>> Elementary Mathematics >> Set theory
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