📘 set theory

1. The problem is to find the set represented by $A' \cap B$, which means the intersection of the complement of set $A$ and set $B$. 2. Recall that $A'$ (or $A^c$) is the complemen

1. The problem involves finding the symmetric difference $A \Delta B$ for given sets $A$ and $B$. The symmetric difference is defined as the set of elements in either $A$ or $B$ bu

1. The problem asks to find the symmetric difference $A \Delta B$ where $A = \{1, 2, 5\}$ and $B = \{2, 3, 5\}$. 2. The symmetric difference of two sets $A$ and $B$ is defined as t

1. The user requests a Venn diagram with images to understand a problem better. 2. Unfortunately, I cannot create or provide images directly.

1. The problem states that in a survey of 100 people, 60 liked coffee, 40 liked tea, and 20 liked both coffee and tea. 2. We need to find how many people liked only coffee.

1. **Stating the problem:** Given two sets $A$ and $B$ with $A \subseteq B$, determine the sets $A - B$ and $B - A$.

1. مسئله را بیان می‌کنیم: ما باید اشتراک و اجتماع مجموعه‌ها را برای داده‌های زیر پیدا کنیم:

1. The problem is to represent the given information in a Venn diagram. 2. A Venn diagram visually shows the relationships between different sets using overlapping circles.

1. The problem involves three sets: \(U\) is the set of whole numbers from 1 to 10, \(A\) is the set of multiples of 3, \(B\) is the set of factors of 6, and \(C\) is the set of od

1. **Stating the problem:** We have a group of students joining three competitions: Colouring (Mewarna), Singing (Menyanyi), and Cooking (Memasak). The table gives numbers for vari

1. **Problem Statement:** A survey of 120 students found 60 liked cricket (C), 55 liked basketball (B), and 20 liked neither.

1. **Problem statement:** We have 15 students studying mathematics, 8 studying physics, 6 studying chemistry, and 3 studying all three subjects. We want to prove that 27 or more st

1. **State the problem:** A company needs 30 programmers for system programming and 40 for application programming. They appoint 55 programmers in total. We need to find how many p

1. **Problem statement:** In a class of 52 students, 30 study C++, 28 study Pascal, and 13 study both languages. We need to find how many students study at least one language and h

1. Problem: Find $n[(A \times B) \cup (A \times C)]$ given $n(A) = 2$ and $n(B \cup C) = 3$. 2. Formula: For sets $A$, $B$, and $C$, the Cartesian product $A \times (B \cup C) = (A

1. **Problem:** Prove the set identity $$A \cap (B - C) = (A \cap B) - (A \cap C)$$. 2. **Recall definitions:**

1. Problem: Verify the set identity \((A \cup B) \cap C = (A \cap C) \cup (B \cap C)\). 2. This is a distributive law in set theory. The formula states that the intersection distri

1. مسئله: تعیین صحت عبارات داده شده درباره مجموعه‌ها و شمارش انواع نگاشت‌ها. 2. برای قسمت (الف): اگر $|A| = n + 1$، باید بررسی کنیم که آیا $|B|$ کامل است یا خیر. این جمله نیاز به ت

1. The problem defines two sets: - Set A: $A = \{x \in \mathbb{R} : |x| < 1/2\}$, which means all real numbers $x$ whose absolute value is less than $1/2$.

1. **State the problem:** We want to prove that the mapping $\pi : x \to x/\sim$ is onto. 2. **Understanding the mapping:** The function $\pi$ maps an element $x$ from a set $X$ to

1. **Problem statement:** Given sets $X = \{2, 3\}$, $Y = \{3, 4\}$, and $Z = \{z, y, m\}$ (assuming $Z$ is a set with elements $z, y, m$), find: 1) $Z \times (X \cap Y)$