diff --git a/100_Numpy_exercises_with_hints.md b/100_Numpy_exercises_with_hints.md
index 905334a..96fa44a 100644
--- a/100_Numpy_exercises_with_hints.md
+++ b/100_Numpy_exercises_with_hints.md
@@ -69,7 +69,7 @@ np.nan in set([np.nan])
 #### 24. Multiply a 5x3 matrix by a 3x2 matrix (real matrix product) (★☆☆)
 `hint:`
 #### 25. Given a 1D array, negate all elements which are between 3 and 8, in place. (★☆☆)
-`hint: >, <=`
+`hint: >, <`
 #### 26. What is the output of the following script? (★☆☆)
 ```python
 # Author: Jake VanderPlas
diff --git a/100_Numpy_exercises_with_hints_with_solutions.md b/100_Numpy_exercises_with_hints_with_solutions.md
index eb83533..8319fdb 100644
--- a/100_Numpy_exercises_with_hints_with_solutions.md
+++ b/100_Numpy_exercises_with_hints_with_solutions.md
@@ -205,7 +205,7 @@ Z = np.ones((5,3)) @ np.ones((3,2))
 print(Z)
 ```
 #### 25. Given a 1D array, negate all elements which are between 3 and 8, in place. (★☆☆)
-`hint: >, <=`
+`hint: >, <`
 
 ```python
 # Author: Evgeni Burovski
diff --git a/100_Numpy_exercises_with_solutions.md b/100_Numpy_exercises_with_solutions.md
index d51bbde..aaafa80 100644
--- a/100_Numpy_exercises_with_solutions.md
+++ b/100_Numpy_exercises_with_solutions.md
@@ -211,7 +211,7 @@ print(Z)
 # Author: Evgeni Burovski
 
 Z = np.arange(11)
-Z[(3 < Z) & (Z <= 8)] *= -1
+Z[(3 < Z) & (Z < 8)] *= -1
 print(Z)
 ```
 #### 26. What is the output of the following script? (★☆☆)
diff --git a/source/exercises100.ktx b/source/exercises100.ktx
index dd7fd99..929cfbf 100644
--- a/source/exercises100.ktx
+++ b/source/exercises100.ktx
@@ -266,7 +266,7 @@ print(Z)
 Given a 1D array, negate all elements which are between 3 and 8, in place. (★☆☆)
 
 < h25
-hint: >, <=
+hint: >, <
 
 < a25
 # Author: Evgeni Burovski