diff --git a/Problem Set 1 Arithmetic/1.6 Find a^b.py b/Problem Set 1 Arithmetic/1.6 Find a^b.py
index 293ba63..833f290 100644
--- a/Problem Set 1 Arithmetic/1.6 Find a^b.py	
+++ b/Problem Set 1 Arithmetic/1.6 Find a^b.py	
@@ -9,9 +9,17 @@
 ## Syntax: pow(base,exponent)
 # exp = pow(a,b)
 
-## Return Modulo for Exponent with Built-in Function
-## Syntax: pow(base,exponent, modulo)
-# exp = pow(a,b,2)
+#function for modular exponentiation i.e., (b^n)%m
+## usage pow(b,n,m)
+def pow(b,n,m):
+  r=1
+  while n:
+    if n%1:
+      r=(r*b)%m
+    b=(b*b)%m
+    n>>=1
+  return r
+      
 
 ## Using Math Library
 # import math