How many As are there in the following series which are immediately followed by B as well as immediately preceded by Z?
A Μ Β Ζ Α Ν Α Α Β Z A B
A Z Β Α Ρ Z Α Β Α Ζ Α Β

Options

A. nil
B. one
C. two
D. three

Explanation

To solve the problem, we need to find how many 'A's in the given series are immediately followed by 'B' and immediately preceded by 'Z'. Let's break down the steps:

### Step-by-Step Solution:

1. **Write down the series**:
The series provided is:
A, M, B, Z, A, N, A, A, B, Z, A, B, A, Z, B, A, P, Z, A, B, A, Z, A, B

2. **Identify the positions of 'A's**:
We will look for 'A's in the series and check their immediate neighbors (preceding and following).

3. **Check each 'A'**:
- **1st A**: (A, M, B, Z) - Preceded by M, followed by B. **Not valid**.
- **2nd A**: (Z, A, N) - Preceded by Z, followed by N. **Not valid**.
- **3rd A**: (A, A, B, Z) - Preceded by A, followed by B. **Not valid**.
- **4th A**: (A, B, Z) - Preceded by A, followed by B. **Not valid**.
- **5th A**: (Z, A, B) - Preceded by Z, followed by B. **Valid**.
- **6th A**: (A, B, A) - Preceded by A, followed by B. **Not valid**.
- **7th A**: (B, A, Z) - Preceded by B, followed by Z. **Valid**.
- **8th A**: (A, P, Z) - Preceded by A, followed by P. **Not valid**.
- **9th A**: (Z, A, B) - Preceded by Z, followed by B. **Valid**.
- **10th A**: (A, Z, A) - Preceded by A, followed by Z. **Not valid**.
- **11th A**: (A, B) - Preceded by A, followed by B. **Not valid**.
- **12th A**: (B, A) - Preceded by B, followed by A. **Not valid**.

4. **Count the valid 'A's**:
From our checks, we found that there are **3 valid 'A's** that meet the criteria:
- The 5th A (preceded by Z, followed by B)
- The 7th A (preceded by B, followed by Z)
- The 9th A (preceded by Z, followed by B)

5. **Final Answer**:
Therefore, the total number of 'A's that are immediately followed by 'B' and immediately preceded by 'Z' is **3**.