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+## descendcombn
+
+### Instructions
+
+- Write a function that prints all possible combinations of `n` different digits in descending order.
+
+- n will be defined as : 10 > n > 0
+
+Below are the references for the **printing format** expected.
+
+- (for n = 1) '9, 8, ..., 3, 2, 1, 0'
+
+- (for n = 3) '987, 986, ..., 020, 019, 018, 017, 016, 015, 014, 013, 012'
+
+### Expected function
+
+```go
+func DescendCombN(n int) {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import "piscine"
+
+func main() {
+	piscine.DescendCombN(9)
+	piscine.DescendCombN(3)
+	piscine.DescendCombN(1)
+}
+```
+
+And its output :
+
+```console
+$ go run .
+9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+987, 986, ..., 018, 017, 016, 015, 014, 013, 012
+987654321, ..., 976543210, 876543210
+$
+```