The following questions are based on letter series in which some letters are missing. The missing letters are given in a proper sequence as one of the alternatives among the given four alternatives under each question
-baa-ba-aabb

Options

A. baba
B. bbaa
C. abbb
D. bbab

Explanation

To solve the problem of finding the missing letters in the series "baa-ba-aabb", we will analyze the pattern step by step.

### Step 1: Identify the Structure of the Series
The given series is "baa-ba-aabb". Let's break it down into parts to understand the sequence better. We can see that the series consists of 12 letters in total, which we can divide into segments.

### Step 2: Segment the Series
We can split the series into segments:
1. baa
2. ba
3. aabb

### Step 3: Analyze the Pattern
Now, let's analyze the segments:
- The first segment is "baa".
- The second segment is "ba".
- The third segment is "aabb".

We can observe that the letters 'a' and 'b' are used in a specific pattern.

### Step 4: Fill in the Missing Letters
To fill in the missing letters, we need to identify the repeating pattern. From the segments, we can see that:
- The first segment starts with "b" and has two "a's".
- The second segment starts with "b" and has one "a".
- The third segment has two "a's" followed by two "b's".

To fill in the missing letters, we can deduce:
- The first missing letter should be "b".
- The second missing letter should be "a".
- The third missing letter should be "b".
- The fourth missing letter should be "b".

### Step 5: Final Sequence
Putting it all together, we can fill in the missing letters:
- The completed sequence becomes: "b a a b a b a a b b".

### Conclusion
Thus, the answer to the question is that the missing letters are "b", "a", "b", and "b".