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
-aa-a-baaa-

Options

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

Explanation

To solve the problem of finding the missing letters in the series "aa-a-baaa-", we will break down the sequence step by step.

### Step-by-Step Solution:

1. **Identify the Structure of the Series**:
The given series is "aa-a-baaa-". We can see that there are some letters missing, and we need to identify a pattern.

2. **Count the Total Letters**:
The series has a total of 14 positions, but currently, we can only see 10 letters with 4 missing. We will denote the missing letters with underscores: "aa_a_baaa_".

3. **Analyze the Existing Letters**:
We can see that the letters 'a' and 'b' are present. Let's write down the sequence we have:
- a a _ a _ b a a a _

4. **Look for Patterns**:
The existing letters appear to follow a pattern. The letter 'a' appears frequently, and 'b' appears less often. We can hypothesize that the sequence may alternate between 'a' and 'b'.

5. **Fill in the Missing Letters**:
- The first missing letter (3rd position) can be filled with 'b' since it seems to alternate with 'a'.
- The second missing letter (5th position) should be 'a' to maintain the pattern.
- The third missing letter (10th position) should be 'b' again.
- The fourth missing letter (14th position) should be 'b'.

Thus, we can fill in the series as follows:
- a a b a a b a a a b

6. **Final Sequence**:
The complete sequence is "aababaabaaab".

7. **Identify the Answer**:
The missing letters we filled in are "b a b b". Therefore, the answer is option number 4: "BABB".