# LeetCode 2028. Find Missing Observations in F#

## URL

Find Missing Observations - LeetCode

## Code

```
let missingRolls (rolls: int list) (mean: int) (n: int) : int list =
let rec missingRolls' n v m acc =
if n = 0 then
acc
else if m > 0 then
missingRolls' (n - 1) v (m - 1) ((v + 1) :: acc)
else
missingRolls' (n - 1) v 0 (v :: acc)
let rollSum = List.sum rolls
let sum = mean * (List.length rolls + n)
let diff = sum - rollSum
if diff < n || diff > 6 * n then
[]
else
let v = diff / n
let m = diff % n
missingRolls' n v m []
```