The sequence in the image suggests a pattern between pairs of numbers. Let's analyze it step by step for each pair:

1. (5, 3) = 28
2. (7, 6) = 55
3. (4, 5) = 21
4. (3, 8) = ?

We need to figure out the logic behind the transformation from pairs of numbers to the result.

Hypothesis: Multiplication and Addition

One possible explanation for the sequence might involve multiplying the two numbers and then performing an additional operation.

Let’s try:

• For (5, 3) = 28:

  • $5 \times 3 = 15$
  • Adding 13 gives us: $15 + 13 = 28$

• For (7, 6) = 55:

  • $7 \times 6 = 42$
  • Adding 13 gives us: $42 + 13 = 55$

• For (4, 5) = 21:

  • $4 \times 5 = 20$
  • Adding 1 gives us: $20 + 1 = 21$

It seems the logic involves multiplying the numbers and adding some constant.

For (3, 8):

• $3 \times 8 = 24$
• Subtracting 7 gives us: $24 - 7 = 17$

Therefore, the missing number is 17.

Would you like more details or further clarification?

Here are 5 questions to expand on this:

1. Could this problem be solved using a different operation?
2. What other possible patterns can explain the given sequence?
3. Can we find a general rule for these kinds of puzzles?
4. How does trial and error help when identifying patterns?
5. How can complex patterns be simplified into steps?

Tip: In puzzles like this, always check combinations of multiplication, addition, and subtraction first!