Added Problem 4

Problem_4.py

@@ -0,0 +1,20 @@
+######################################################################
+# A palindromic number reads the same both ways. The largest palindrome
+# made from the product of two 2-digit numbers is 9009 = 91 × 99.
+#
+# Find the largest palindrome made from the product of two 3-digit numbers.
+#
+######################################################################
+
+maxProduct = 0
+
+for i in range(999, 99, -1):
+    for j in range(999, 99, -1):
+        product = str(i*j)
+
+        if product == product[::-1]:
+            if int(product) > maxProduct:
+                maxProduct = int(product)
+
+print(maxProduct)
+# Solution: 906609