Solution:The pattern followed here is :1st number × 2 = 2nd number
(3926 - 7852) → 3926 × 2 = 7852
(7624 - 15248) → 7624 × 2 = 15248
(5826 - 11652) → 5826 × 2 = 11652
But,
(1658 - 3216) → 1658 × 2 = 3316 ≠ 3216
Hence, (1658 - 3216) is the correct answer.