gaokao 2017 Q1

gaokao · China · national-II-arts Probability Definitions Set Operations

Let the set $A = \{1,2,3\}$, $B = \{2,3,4\}$, then $A \cup B =$
A. $\{1,2,3,4\}$
B. $\{1,2,3\}$
C. $\{2,3,4\}$
D. $\{1,1,4\}$

Let the set $A = \{1,2,3\}$, $B = \{2,3,4\}$, then $A \cup B =$

A. $\{1,2,3,4\}$

B. $\{1,2,3\}$

C. $\{2,3,4\}$

D. $\{1,1,4\}$