fix index out of range error

scripts/quiz/generators.py

@@ -6,7 +6,7 @@ from .utils import get_next_difficulty, generate_start_step
 def start_interactive_math(difficulty=0.01, do_increase: True | False = True):
     next_difficulty = get_next_difficulty(difficulty, do_increase)
     start, step = generate_start_step(difficulty)
-    question_data = generate_question_data(start, step, question_num=random.randint(0, 5))
+    question_data = generate_question_data(start, step, question_num=random.randint(0, 4))
 
     question = question_data['question']
     start = question_data['start']