consist of basic operations.😃

Tanmay-901 · web-flow · commit 1057d0c16597 · 2020-08-21T00:59:23.000+05:30
diff --git a/README.md b/README.md
@@ -12,6 +12,11 @@
 #### bitwise operator leftshift {<<} : (100 << 2 = 400)  
 
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+### sum of n numbers:O(1)  
+```python
+def sum_total(n):
+    return int(n*(n+1)/2)
+```
 ### Odd-Even:O(1)  
 ```python
 if n&1 == 1:
