diff --git a/Algo/Courses/Chapter 6 - Lists (Exercises).md b/Algo/Courses/Chapter 6 - Lists (Exercises).md
index c732d15..3348764 100644
--- a/Algo/Courses/Chapter 6 - Lists (Exercises).md	
+++ b/Algo/Courses/Chapter 6 - Lists (Exercises).md	
@@ -114,6 +114,16 @@ let maximum = function
 let rec arith_list n a1 r =
   if n <= 0 then []
   else a1 :: arithmetic_list (n - 1) (a1 + r) r;;
+
+(*Other solution*)
+# let arith_list n a1 r =
+	if n <= 0 then
+		invalid_arg "invalid rank n"
+	else
+		let rec f ai = function
+			| 0 -> []
+			| i -> (a1+(n-i)+r)::f(ai+r) (i-1)
+		in f ai n;;
 ```
 
 ## Exercise 2.2
@@ -121,3 +131,13 @@ let rec arith_list n a1 r =
 let concatenate_lists lst1 lst2 =
   lst1 @ lst2;;
 ```
+
+## Exercise 3.1
+```Ocaml
+let growing i =
+	if i = [] then false
+	else 
+		let rec grow =
+			let e::t = i in
+			let test = e in
+			if e