In South Korea people play the biggest role
If A ∆ B = A × (A + 2B) = A² + 2AB, then
• 1 ∆ B = 1 + 2B
• 4 ∆ (1 ∆ B) = 4 ∆ (1 + 2B) = 24 + 16B
• 2 ∆ (4 ∆ (1 ∆ B)) = 2 ∆ (24 + 16B) = 100 + 64B
An urban environment would be a city, so the answer is a bank clerk. Farmer is agriculture and Factory and Railroad workers are industrial
