To solve this pattern, we will examine each row and look for a consistent arithmetic operation that can be applied across the rows.

Let's analyze each row individually:

1. First row: 9, 1, 6, 4
   We can check different operations:

   • $9 - 1 = 8$, but $8 - 6 \neq 4$
   • $9 \div 1 = 9$, but $9 \div 6 \neq 4$
   • $9 + 1 = 10$, but $10 - 6 \neq 4$

   Let's instead try multiplication and division:

   • $9 \div 1 = 9$, $9 - 6 = 3$, and $3 + 1 = 4$

This could be a combination of operations involving subtraction, addition, and division. Let's apply this idea to the next rows.

2. Second row: 4, 5, 7, 2
   Applying similar logic:
   • $4 \times 1 = 4$, $4 + 3 = 7$, but does not fit
   • Let’s try adjusting