Explanation

The pattern follows an alternating increase and decrease:

• 1 → 7 (+6)
• 7 → 3 (-4)
• 3 → 6 (+3)
• 6 → 5 (-1)
• 5 → 5 (0)

Continuing the pattern:

• 5 → 7 (+2)
• 7 → 4 (-3)