1!+2!+3!3+2!+3!+4!4+3!+4!+5!5+⋯+98!+99!+100!100
Find the value of the expression above.
The answer is a form of a!1−b!1. Submit your answer as a×b.
Notation: ! is the factorial notation. For example, 8!=1×2×3×⋯×8.
This problem is one of my set, Let's Practice.