Multiple choice general knowledge math & puzzles Complete the series 25,26,199,? 299 486 676 758 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The series follows 25 × n^3 ± 1 for n=1,2,3: 25×1+1=26, 25×8-1=199, 25×27+1=676. The multipliers are cubes (1, 8, 27 = 1³, 2³, 3³) and adjustments alternate (+1, -1, +1). Therefore the 4th term is 676, which is 26².