The pattern is: 4×1+2=6, 6×2+6=18, 18×2.5+14=59 (not 49), 59×3+24=201, 201×4+407=1011. The multipliers increase by 0.5 (1, 1.5, 2, 2.5, 3, 4) and added numbers follow a pattern. Option 18 is where the pattern breaks - it should be approximately 59, not 49.