Explanation:

- The series given is X_YZ_X_YZY_X. We need to find the missing sequence.

- Let's examine the series:

- The series follows a pattern involving repetitions and insertions of sequences.

- Start: X (missing) YZ X (missing) YZY X.

- Look for consistent patterns or repeat sequences.

- Option 1: XZYZ

- Try this in the blank spaces: X(XZYZ)YZ X(XZYZ)YZ YZY X

- It seems to create an incomplete or incorrect pattern.

- Option 2: ZYXY

- Try this in the blank spaces: X(ZYXY)YZ X(ZYXY)YZ YZY X

- Does not seem to form a logical pattern.

- Option 3: YZXZ

- Try this in the blank spaces: X(YZXZ)YZ X(YZXZ)YZY X

- This option fits: parts of the series repeat consistently.

- Option 4: YYZZ

- Examine this: X(YYZZ)YZ X(YYZZ)YZ YZY X

- Disrupts the expected repeat formation in the series.

- Correct Answer: Option 3 - YZXZ

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