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The image contains a math test on the topic of *"Pola Bilangan"* (Number Patterns) with a set of questions asking to solve pattern-based problems. Let's break them down:

### 1. Look at the configuration of the shapes.
- **(a)** Determine how many triangles are in pattern 10.
- **(b)** Find the formula for the \(n\)-th term \(U_n\) of this configuration.

### 2. A sequence is given: 1, 3, 6, 10, 15, 21, ...
- **(a)** Is this sequence an arithmetic sequence? Explain your reasoning.

### 3. A sequence is given: 36, 33, 30, 27, ...
- **(a)** Determine the 12th term of this sequence.
- **(b)** Find the formula for the \(n\)-th term \(U_n\) of this sequence.
- **(c)** Find the sum of the sequence up to the 12th term.

### 4. An arithmetic sequence is given with the 5th term as 31 and the 9th term as 59.
- **(a)** Determine the first term and the common difference of the sequence.
- **(b)** Find the 15th term of the sequence.
- **(c)** Find the sum up to the 15th term.

### 5. In an auditorium, there are 15 rows of seats. The first row has 18 seats, the second row has 21, and each subsequent row has 3 more seats than the previous.
- **(a)** Determine the number of seats in the last row.
- **(b)** Find the total number of seats in the entire auditorium.

### 6. A geometric sequence is given: 8, 4, 2, 1, ...
- **(a)** Find the next two terms.
- **(b)** Determine the 8th term.

### 7. A geometric sequence with the 3rd term as 6 and the 4th term as 9.
- Determine the ratio and the first term of the sequence.

### 8. An amoeba doubles every 15 minutes. If there are 3 amoebas at the start, calculate how many amoebas there will be after 2 hours.

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Penilaian Sumatif Akhir Bab II - Materi: Pola Bilangan. A set of 8 questions focusing on number patterns, arithmetic sequences, and geometric progressions.

Learn to solve a variety of problems related to number patterns, including arithmetic and geometric sequences, finding the nth term, and summation of series. Ideal for students in Grades 7-9.

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