diff --git a/01_Day_Introduction/helloworld.py b/01_Day_Introduction/helloworld.py
index d8007868f..2dea38556 100644
--- a/01_Day_Introduction/helloworld.py
+++ b/01_Day_Introduction/helloworld.py
@@ -22,4 +22,4 @@
 print(type('Asabeneh'))          # String
 print(type([1, 2, 3]))           # List
 print(type({'name': 'Asabeneh'}))  # Dictionary
-print(type({9.8, 3.14, 2.7}))    # Tuple
+print(type({9.8, 3.14, 2.7}))    # set
diff --git a/04_Day_Strings/04_strings.md b/04_Day_Strings/04_strings.md
index 9d09d2cfe..b96f02559 100644
--- a/04_Day_Strings/04_strings.md
+++ b/04_Day_Strings/04_strings.md
@@ -560,7 +560,6 @@ print(challenge.startswith('thirty')) # False
 24. Use rindex to find the position of the last occurrence of the word because in the following sentence: 'You cannot end a sentence with because because because is a conjunction'
 25. Slice out the phrase 'because because because' in the following sentence: 'You cannot end a sentence with because because because is a conjunction'
 26. Find the position of the first occurrence of the word 'because' in the following sentence: 'You cannot end a sentence with because because because is a conjunction'
-27. Slice out the phrase 'because because because' in the following sentence: 'You cannot end a sentence with because because because is a conjunction'
 28. Does 'Coding For All' start with a substring _Coding_?
 29. Does 'Coding For All' end with a substring _coding_?
 30. '   Coding For All      '  , remove the left and right trailing spaces in the given string.