How to use sigma problem for multiple server excel

Welcome to the board.

Create named ranges L, u, and k

Create named formula n refers to: =ROW(INDIRECT("1:" & k-1)) - 1

Then

Row\Col	A	B	C
1	L	6
2	u	5
3	k	3
4	P0	0.316456	B4: {=1/SUM( (L/u)^n / FACT(n) + (L/u)^k / FACT(k) * (k * u) / (k * u - L))}

The curly braces mean that the formula MUST be confirmed with Ctrl+Shift+Enter instead of just Enter.