Grade 7: Sets

Which of the following is a well-defined set?

• A set of beautiful sceneries

• A set of good basketball players

• A set of Philippine Presidents

• A set of successful leaders

Which of the following is the symbol of an empty set?

•  $\cap$  

•  $\cup$  

•  $\subseteq$  

•  $\phi$  

Which of the following is a subset of A = {1, 2, 3}?

• {0}

• {0, 1}

• {1, 2}

• {2, 3, 4}

Given the set of letters in the word "mathematics", what is the cardinality of the given set?

• 11

• 8

• 6

• 4

Which of the symbol is used to indicate the intersection of two sets?

• $\cup$

• $\cap$

• $-$

• $\phi$

The following is a subset of R = {n, e, w}, EXCEPT?

• {n, e, w}

• {e}

• {0}

• { }

If A = {1, 2, 3, 4, 5, 6}
B = {1, 3, 5, 7}
C = {2, 4, 6, 8}
then what is A $\cup$  B ?

• {1, 2, 3, 4, 5, 6, 7}

• {1, 2, 3, 4, 5, 7, 8}

• {3}

• {1, 3, 4, 5, 7, 8}

Which of the following set has the cardinality equals to 5?

• Set A is the set of counting numbers less than 5.

• Set B is the set of letters in the word "RACER."

• Set C is the set of positive multiples of 5.

• Set D is the set of names of the fingers.

Given C = {5, 10, 15, 20} and B = {25}, find A  $\cap$  B.

• {5, 10, 15, 20, 25}

• {5, 10, 15, 20}

• { }

• {0}

Given E = {pig, goat, cow, horse} and F = {chicken, duck}, find E-F.

• {pig, goat, cow, horse, chicken, and duck}

• {pig, goat, cow, horse}

• {chicken, duck}

• { }