aab - aaa - bba -

Options

A. baa
B. abb
C. babc c
D. aab

Explanation

To solve the series completion question: aab - aaa - bba - __, we need to identify the pattern in the given sequence.

### Step-by-Step Solution:

1. **Identify the Given Terms**:
The terms provided are:
- 1st term: aab
- 2nd term: aaa
- 3rd term: bba

2. **Analyze the Pattern**:
Let's break down the terms:
- The first term 'aab' consists of two 'a's followed by one 'b'.
- The second term 'aaa' consists of three 'a's.
- The third term 'bba' consists of two 'b's followed by one 'a'.

3. **Look for a Repeating Pattern**:
We can observe that:
- The first term has 2 'a's and 1 'b'.
- The second term has 3 'a's.
- The third term has 2 'b's and 1 'a'.

It seems that the pattern is alternating between 'a's and 'b's, with the number of 'a's and 'b's changing.

4. **Predict the Next Term**:
Following the pattern:
- After 'bba', we might expect a term that continues the sequence of 'a's and 'b's.
- The previous terms suggest a pattern of increasing 'a's or 'b's.

5. **Testing Options**:
Let's test the options provided:
- If we consider 'b a a', we can see that it fits the pattern of alternating 'a's and 'b's.
- Continuing from 'bba', we could have 'b a a' as the next term.

6. **Conclusion**:
Therefore, the next term in the series should be 'baa'.

### Final Answer:
The next term in the series is 'baa'.