Which sequence of letters when placed in the blanks one after the other will complete the given letter series ?
a-baa-baa-ba

Options

A. aab
B. bab
C. bba
D. bbb

Explanation

To solve the problem of completing the letter series "a-baa-baa-ba", we need to identify the pattern in the sequence and determine which option fits best. Let's go through the solution step by step:

### Step 1: Analyze the Given Sequence
The given sequence is: A - BAA - BAA - BA.

We can break it down as follows:
- The first part is "A".
- The second part is "BAA".
- The third part is also "BAA".
- The fourth part is "BA".

### Step 2: Identify the Pattern
From the sequence, we can observe:
- The first letter is "A".
- The next two segments are "BAA", which suggests a repetition of "BAA".
- The last segment is "BA", which indicates that we might need to continue the pattern of "BAA".

### Step 3: Check the Options
We have four options to fill in the blanks:
1. AAB
2. BAB
3. BBA
4. BBB

We need to check which of these options can be placed in the blanks to maintain the sequence.

### Step 4: Test Each Option
Let's test the options one by one:

#### Testing Option 1: AAB
- Sequence would be: A - BAA - BAA - BA - AAB
- This doesn't follow the pattern.

#### Testing Option 2: BAB
- Sequence would be: A - BAA - BAA - BA - BAB
- This doesn't follow the pattern.

#### Testing Option 3: BBA
- Sequence would be: A - BAA - BAA - BA - BBA
- This doesn't follow the pattern.

#### Testing Option 4: BBB
- Sequence would be: A - BAA - BAA - BA - BBB
- This gives us: A - B - B - A - B - B - A - B - B - A
- This follows the pattern of repeating "BAA".

### Conclusion
The correct option that completes the sequence is **Option 4: BBB**.