pls help me guys

1. which of the following collection make up a set
a. ( pine tree, acasia tree, mango tree)
b. (a list of PBA player)
c. (dog, table, ocean)
d. (CPU, Laptop, Cellphone)

2. the cardinality of a set A is written as.
a. n(A)
b. c(A)
c. (n)A
d. A(c)


3. what do you call a set with an uncountable number of object.
a. finite set
b. infinite set
c. null set
d. empty set

4. what do you call the object or things that make up a set
a. member of a set
b. group of a set
c. counting number
d. letter

5. the sets, are usually represented by.
a. small letters
b. upper case letters
c. capital letters
d. numbers​