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+### Q2. 25%, Checking mathematical series number
+
+Fibonacci Sequence
+
+Write a Python function named `check_mathematical_series` that takes a positive integer n as input and checks whether the given number belongs to any of the following important mathematical series: `Fibonacci sequence`, `Triangular sequence`, `Square sequence`.
+
+The function should determine the series type and return a string indicating the result.
+
+The possible return values are:
+
+- "Fibonacci" if the number belongs to the Fibonacci sequence.
+- "Triangular" if the number belongs to the Triangular sequence.
+- "Square" if the number belongs to the Square sequence.
+- "None" if the number does not belong to any of the above sequences.
+
+For this question, consider the following definitions for the series:
+
+1. Fibonacci sequence: A series of numbers in which each number (after the first two) is the sum of the two preceding ones. The sequence starts with 0 and 1. For example, the Fibonacci sequence begins as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, …
+
+```python
+def fibonacci_sequence(n):
+    # Check if the input is valid
+    if n <= 0:
+        return []
+    elif n == 1:
+        return [0]
+    elif n == 2:
+        return [0, 1]
+    
+    # Initialize the sequence with the first two numbers
+    sequence = [0, 1]
+    
+    # Generate the Fibonacci sequence
+    for i in range(2, n):
+        next_num = sequence[-1] + sequence[-2]
+        sequence.append(next_num)
+    
+    return sequence
+```
+
+2. Triangular sequence: A sequence of numbers in which each term represents the
+total number of dots required to form a triangle with that many dots on each side.
+The nth term of the triangular sequence is given by the formula (n * (n + 1)) / 2.
+For example, the triangular sequence begins as follows: 1, 3, 6, 10, 15, …
+
+
+```python
+def triangular_sequence(n):
+    # Check if the input is valid
+    if n <= 0:
+        return []
+    
+    # Initialize the sequence with the first number
+    sequence = [1]
+    
+    # Generate the Triangular sequence
+    for i in range(2, n+1):
+        next_num = sequence[-1] + i
+        sequence.append(next_num)
+    
+    return sequence
+```
+
+
+Square number sequence: A sequence of numbers that are the squares of
+consecutive integers. For example, the square number sequence begins as follows:
+1, 4, 9, 16, 25, 36, ...
+Write the check_mathematical_series function and test it with the following values
+of n:
+    - 21
+    - 9
+    - 17
+    - 10
+
+```python
+def square_number_sequence(n):
+    # Check if the input is valid
+    if n <= 0:
+        return []
+    
+    # Initialize the sequence with the first number
+    sequence = [1]
+    
+    # Generate the Triangular sequence
+    for i in range(2, n+1):
+        next_num = sequence[-1] + i
+        sequence.append(next_num)
+    
+    return sequence
+```
+
+Print the result for each value of n, indicating the series types to which it belongs.
+
+Using commas (,) if it belongs to more than 1 series.
+
+"None" if it doesn't belong to any of the series.
+
+Your function should have the following signature:
+
+```python
+def check_mathematical_series(n: int) -> str:
+```
+
+# Your code here
+
+Example output:
+
+```python
+n = 21: Fibonacci, Triangular
+n = 9: Square
+n = 17: None
+n = 10: Triangular
+```
+
+Note: You can assume that the given n will be a positive integer
+
+
+Q: 
+有冇話係邊到學python最好？
+我睇完data camp都唔識 🙃🙃
+覺得自己好蠢。
+
+A:
+你方唔方便比份 notes 我望一望？
+同埋你係咪理科生？