M30-2 Set Theory - Day 1 Practice

A survey of 40 teachers was conducted. Within the last week, 23 drank coffee, 19 drank tea, and 4 drank neither coffee nor tea. The number of teachers who drank both coffee and tea is

(a)  

A survey of 40 teachers was conducted. Within the last week, 23 drank coffee, 19 drank tea, and 4 drank neither coffee nor tea. The number of teachers who drank coffee or tea is

(a)  

A survey of 40 teachers was conducted. Within the last week, 23 drank coffee, 19 drank tea, and 4 drank neither coffee nor tea. The number of teachers who drank only tea (tea, but not coffee) is

(a)  

State the number of elements in the universal set. Note: A "guinea pig" is one type of animal, not two.

(a)  

Check all of the statements that are true.

•  $R\subset M$  

•  $M\subset R$  

•  $L\subset A$  

•  $L\subset M$  

•  $A\subset R$  

Check all of the statements that are true.

• R, M are disjoint sets; $R\cap M=\phi$

• R, L are disjoint sets; $R\cap L=\phi$

• R, A are disjoint sets; $R\cap A=\phi$

• M, L are disjoint sets; $M\cap L=\phi$

• L, A are disjoint sets; $L\cap A=\phi$

The number of elements in M' is

• 2

• 3

• 4

• 5

The number of elements in  $M\cup L$  is

• 4

• 5

• 7

• 8

• 0

The number of elements in  $M\cap L$  is

• 4

• 5

• 7

• 8

• 0

The number of elements in  $M\cup R$  is

• 1

• 2

• 3

• 5

• 0