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+## Recursive solution using Python
+```python
+def sum(n):
+    if not n >= 1 & n <= 10e9:
+        print("n must be in the scope [1, 10e9]")
+    
+    if n == 1:
+        return 1
+    else:
+        return n + sum(n-1)
+    
+print (sum(10))
+```