To solve the problem, we analyze the relationship between the first four numbers and the fifth number in each row, focusing on consistent patterns. Here's the key observation:

Step 1: Identify patterns in existing rows

Looking at row 3: 6, 2, 1, 4. We test combinations of these numbers to find a logical result for the fifth position.

A consistent pattern across some rows (and plausible for row 3) is second number × fourth number:

• For row 3: 2 (second) × 4 (fourth) = 8.

Conclusion

The missing number in row 3 is 8.

Answer: 8

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