diff --git a/zeta_python/2981.py b/zeta_python/2981.py
new file mode 100644
index 0000000..676a0e8
--- /dev/null
+++ b/zeta_python/2981.py
@@ -0,0 +1,9 @@
+N = int(input())
+I = sorted([int(input())for i in range(N)])
+p = min([(j-i) for i, j in zip(I, I[1:])])
+print(p)
+T = [t for t in range(1, int(p**(1/2))+1) if p % t == 0]
+if T[-1] == p // T[-1]:
+    print(" ".join([str(t) for t in T[1:-1]] + [str(p // t) for t in T[::-1]]))
+else:
+    print(" ".join([str(t) for t in T[1:]] + [str(p // t) for t in T[::-1]]))
diff --git a/zeta_python/completed/11050.py b/zeta_python/completed/11050.py
new file mode 100644
index 0000000..816e718
--- /dev/null
+++ b/zeta_python/completed/11050.py
@@ -0,0 +1,13 @@
+N, K = map(int, input().split())
+
+
+def C(n, k):
+    if n == 1:
+        return 1
+    elif k == 0 or k == n:
+        return 1
+    else:
+        return C(n - 1, k) + C(n - 1, k - 1)
+
+
+print(C(N, K))
diff --git a/zeta_python/completed/11051.py b/zeta_python/completed/11051.py
new file mode 100644
index 0000000..eedbd0a
--- /dev/null
+++ b/zeta_python/completed/11051.py
@@ -0,0 +1,17 @@
+import sys
+sys.setrecursionlimit(12000)
+N, K = map(int, input().split())
+Mem = [[0]*1001for i in range(1001)]
+
+def C(n, k):
+    if n == 1:
+        return 1
+    elif k == 0 or k == n:
+        return 1
+    if Mem[n][k] != 0:
+        return Mem[n][k]
+    t = (C(n - 1, k) + C(n - 1, k - 1)) % 10007
+    Mem[n][k] = t
+    return t
+
+print(C(N, K))
diff --git a/zeta_python/completed/2609.py b/zeta_python/completed/2609.py
new file mode 100644
index 0000000..54764cf
--- /dev/null
+++ b/zeta_python/completed/2609.py
@@ -0,0 +1,8 @@
+A, B = map(int, input().split())
+p = 1
+for i in range(A, 1, -1):
+    if A % i == 0 and B % i == 0:
+        p = i
+        break
+print(p)
+print(A*B//p)
\ No newline at end of file