1 files changed, 4 insertions, 0 deletions
diff --git a/progs/a918.py b/progs/a918.py
new file mode 100644
index 0000000..642d76d
--- /dev/null
+++ b/progs/a918.py
@@ -0,0 +1,4 @@
+def difference(n) :  
+    S = (n*(n + 1))//2;  
+    res = S*(S-1);  
+    return res;  
+\ No newline at end of file