To solve the problem, we analyze the patterns in the rows:

Step 1: Observe the first differences (between the first and second elements of each row)

• Row 1: (5 - 2 = 3)
• Row 2: (7 - 3 = 4)
• The pattern of first differences is increasing by 1 each row: (3 \rightarrow 4 \rightarrow 5)

Thus, the first difference for Row 3 should be 5:
(? - 4 = 5 \implies ? = 4 + 5 = 9)

Step 2: Verify with the second differences (between the second and third elements)

• Row1: (12 - 5 = 7)
• Row2: (17 -7 =10)
• The pattern of second differences increases by 3 each row: (7 \rightarrow10 \rightarrow13)

For Row3: (22 - ? =13 \implies ?=22-13=9)

Answer: 9

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