diff --git a/combination sum.py b/combination sum.py
new file mode 100644
index 00000000..a2964256
--- /dev/null
+++ b/combination sum.py	
@@ -0,0 +1,21 @@
+class Solution:
+    def combinationSum(self, candidates: List[int], target: int) -> List[List[int]]:
+        self.result=[]
+        self.helper(candidates,target,0,[])
+        return self.result
+    def helper(self,candidates,target,i,path):
+
+        #basecase
+        if target<0 or i==len(candidates):
+            return
+        if target==0:
+            self.result.append(path)
+            return
+
+        #nochoose case
+        self.helper(candidates,target,i+1,list(path))
+        #choose case
+        path.append(candidates[i])
+        self.helper(candidates,target-candidates[i],i,list(path))
+
+        
\ No newline at end of file