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

Options

A. aapp
B. apap
C. ppbp
D. bbaa

Answer

To solve the problem of completing the letter series "ab - ab - a - pab -", we need to identify a pattern in the sequence and fill in the blanks with the correct letters.

### Step-by-Step Solution:

1. **Identify the Given Sequence**:
The sequence provided is:
- ab
- ab
- a
- pab

2. **Analyze the Pattern**:
Let's break down the sequence:
- The first two parts are "ab", which is repeated.
- The third part is just "a".
- The fourth part is "pab".

3. **Look for the Missing Letters**:
We need to fill in the blanks represented by dashes. The sequence can be visualized as:
- ab - ab - a - pab -
- Here, we have three blanks to fill.

4. **Consider the Options**:
The options provided are:
- A: A P P
- B: P P B
- C: P P P
- D: B B A

5. **Test Each Option**:
We will test each option to see which one fits the sequence:
- **Option A (A P P)**:
- Sequence becomes: ab A ab A a P pab
- This does not follow the pattern.
- **Option B (P P B)**:
- Sequence becomes: ab P ab P a B pab
- This does not follow the pattern.
- **Option C (P P P)**:
- Sequence becomes: ab P ab P a P pab
- This follows the pattern.
- **Option D (B B A)**:
- Sequence becomes: ab B ab B a A pab
- This does not follow the pattern.

6. **Conclusion**:
The option that fits the sequence is **Option C (P P P)**.

Thus, the completed sequence is:
- ab P ab P a P pab