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The image contains three mathematical questions about functions (hàm ánh) and their properties.

### Question 1: "g có phải đơn ánh không?"
This question asks whether the function \( g \) is injective (one-to-one).

The function \( g \) is defined from the set \( \{1, 2, 3, 4\} \) to the set \( \{a, b, c, d\} \), with the following mappings:
\[
g(1) = 2, \quad g(b) = 1, \quad g(c) = 3, \quad g(d) = 2
\]

Since \( g(d) = g(1) = 2 \), the function is not injective because two different inputs (1 and \( d \)) map to the same output (2). So, the answer is **Sai (False)**.

### Question 2: "Hàm f là hàm gì?"
This question asks for the type of function \( f \). The function \( f \) maps \( \{1, 2, 3, 4\} \) to \( \{a, b, c, d\} \) as follows:
\[
f(1) = d, \quad f(2) = c, \quad f(3) = a, \quad f(4) = b
\]

Since every element in the domain \( \{1, 2, 3, 4\} \) is mapped to a unique element in the codomain \( \{a, b, c, d\} \), the function is **bijective (toàn ánh)**.

So, the correct answer is **toàn ánh**.

### Question 3: "Một công ty có 10 bộ phận..."
This question is about a function mapping employees to departments, where every employee is assigned to one department, and each department has at least one employee. This describes a **surjective (onto)** function because every department is filled (no department is left empty).

So, the correct answer is **toàn ánh**.

Would you like a more detailed explanation of any part of this? Here are some related questions:

1. What is the difference between injective, surjective, and bijective functions?
2. How can you check if a function is injective?
3. What real-life examples correspond to injective and surjective functions?
4. What happens if a function is neither injective nor surjective?
5. Can a function be injective but not surjective?

**Tip**: When analyzing functions, carefully check how inputs map to outputs, especially to verify if the mapping is unique or covers the entire range.

The image contains three questions about functions and their properties, specifically whether they are injective (one-to-one), surjective (onto), or bijective.

Analyze functions to determine whether they are injective, surjective, or bijective. Learn how functions map inputs to outputs with clear examples and explanations. Suitable for high school students.

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