Introduction to Sets

Check the 3 items that shows a well-defined set

• A collection of beautiful songs

• A group of odd numbers.

• A set of small numbers

• A set of distinct letters of the word "PANDEMIC".

• A set of all good books

The following are well-defined set EXCEPT.

• Group of enjoyable subject in high school.

• Group of dry ingredients for Goldilocks Chiffon cake.

• Group of Philippine Presidents from past to present.

• Group of Junior High School teachers in Caraga Regional Science High School

Which of the set below is well-defined?

• A set of fruits high in Vitamin C.

• A set of soap that effectively whitens the skin.

• A set of delicious food.

• A set of heroes

Which of the following describes the set P = {12, 15, 18} using set-builder notation?

• P = {v | v is a multiple of 6 greater than 12 but less than 20}

• P = {b | b is a multiple of 3 greater than 10 but less than 20}

• P = {g | g is a multiple of 3 greater than 12 but less than 20}

• P = {w | w is a multiple of 6 greater than 10 but less than 20}

Which of the following describes the set W = {Luzon, Visayas, Mindanao} using set-builder notation?

• W = {e : e is a Chinese island group}

• W = {m | m is a Japanese island group}

• W = {k : k is a Philippine island group}

• W = {p | p is an African island group}

Which of the following describes the set G = {2, 3, 4, ..., 100} using set-builder notation?

• G = {c : c is a number from 1 to 100}

• G = {d : d is a number between 2 and 100}

• G = {i : i is a number between 1 and 100}

• G = {s | s is a number from 2 to 100}

How is set D = the set of months of the year with less than 31 days described using roster method?

• D = {January, March, May, July, August, October, December}

• D = {February, April, June, September, November}

• D = {April, June, September, November}

• D = {September, October, November, December}

How is set D = the set of weekdays described using roster method?

• D = {Saturday, Sunday}

• D = {Monday, Tuesday, Wednesday, Thursday, Friday}

Which of the following describes the set L = {2, 3, 5, 7, 11, ...} using set-builder notation?

• L = {f : f is an odd number greater than or equal to 2}

• L = {e : e is a counting number greater than or equal to 2}

• L = {r : r is an even number greater than or equal to 2}

• L = {j : j is a prime number greater than or equal to 2}

How is set A = {x | x is a distinct letter in the word PHILIPPINES} described using roster method?

• {P, H, I, L, P, N, E, S}

• {P, H, I, L, I, N, E, S}

• {P, H, I, L, I, P, P, I, N, E, S}

• {P, H, I, L, N, E, S}