Below is a program written in four programming languages. 5 runs of the program were performed, with the following pairs of numbers (s, t) entered as values for the variables s and t. Select ALL pairs of numbers for which the program will print "YES", and write the numbers of the pairs in ascending order in the answer field.

Analysis of the program's logic:

The program prints "YES" if the condition (s < 5) and (t > 5) is true. Otherwise, it prints "NO". Let's check each pair:

• 1) (2, 7): s = 2, t = 7. Condition: (2 < 5) is true, and (7 > 5) is true. Both are true, so the output is "YES".
• 2) (6, 9): s = 6, t = 9. Condition: (6 < 5) is false. The overall condition is false, so the output is "NO".
• 3) (4, 8): s = 4, t = 8. Condition: (4 < 5) is true, and (8 > 5) is true. Both are true, so the output is "YES".
• 4) (5, 7): s = 5, t = 7. Condition: (5 < 5) is false. The overall condition is false, so the output is "NO".
• 5) (-1, 5): s = -1, t = 5. Condition: (-1 < 5) is true, but (5 > 5) is false. The overall condition is false, so the output is "NO".

The pairs for which the program prints "YES" are (2, 7) and (4, 8). These correspond to options 1 and 3.

The question asks to write the numbers of the selected pairs in ascending order.

Answer: 1, 3