What is the value of 1 × 1! + 2 × 2! + 3 × 3! + . . . . . . . . n × n! where n! means n factorial or n(n-1) (n-2) . . . . . . . . 1

• ক (n + 1)! - n!
• খ (n + 1)! - {n × (n - 1)}
• গ n × (n - 1) × (n - 1)!
• ঘ (n + 1)! - 1! ✅ সঠিক উত্তর