1 files changed, 5 insertions, 0 deletions
diff --git a/progs/a507.py b/progs/a507.py
new file mode 100644
index 0000000..ac38919
--- /dev/null
+++ b/progs/a507.py
@@ -0,0 +1,5 @@
+def sum_Pairs(arr,n): 
+    sum = 0
+    for i in range(n - 1,-1,-1): 
+        sum += i*arr[i] - (n-1-i) * arr[i] 
+    return sum
+\ No newline at end of file