Answer:

>>> Mathematics

• Number 1

The set of even natural numbers: {2, 4, 6, 8, 10, ...}

• Number 2

Set of odd natural numbers: {1, 3, 5, 7, 9, ...}

• Number 3

The set of positive integers: {1, 2, 3, 4, 5, ...}

• Number 4

Set of negative integers: {..., -5, -4, -3, -2, -1}

• Number 5

The set of real numbers: all numbers that can be written as fractions or infinite decimals, such as {0, 1, 1.5, 2, 2.2, 3.14159, ...}

• Number 6

The set of rational numbers: all the numbers that can be written as a fraction, such as {1/2, 3/4, -2/3, 0}

• Number 7

The set of irrational numbers: all the numbers that cannot be written as a fraction, such as {√2, √3, π, e}

• Number 8

The set of complex numbers: all numbers that can be written in the form a + bi, where a and b are real numbers, and i is the imaginary unit (i^2 = -1), like {2 + 3i, -1 + 2i, 4i , 7}

• Number 9

The set of prime numbers: {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, ...}

• Number 10

The set of composite numbers: all numbers that are not prime, such as {4, 6, 8, 9, 10, 12, 14, ...}

• Number 11

Set of letters of the alphabet: {a, b, c, d, e, ..., z}

• Number 12

Set of family members: {father, mother, grandfather, grandmother, children, brothers, sisters, uncles, aunts, cousins, ...}

• Number 13

List of countries in the world: {Indonesia, United States, Japan, Australia, United Kingdom, Canada, France, ...}

• Number 14

The set of electronic objects: {television, computer, cell phone, camera, speaker, printer, ...}

• Number 15

List of animals that live in water: {fish, dolphin, whale, shark, lobster, squid, ...}

• Number 16

Tropical fruit set: {mango, banana, durian, rambutan, jackfruit, guava, ...}

• Number 17

The set of flowers: {rose, jasmine, orchid, lily, tulip, sun, ...}

• Number 18

The set of objects used in sports: {ball, racket, sneakers, court, net, surfboard, ...}

• Number 19

The set of vehicle types: {cars, motorcycles, boats, planes, trains, buses, bicycles, ...}

• Number 20

Technology company set: {Apple, Google, Microsoft, ...}

Explain: A set in mathematics is a collection of objects or elements that have one or more of the same or simultaneous properties, and is represented by a curly bracket symbol or notation {}. A set can consist of different objects, such as numbers, letters, words, objects, etc.

• 3 March 2023