In following question a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces.0.5, 1.5, 4.5, 13.5.
In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If the attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly, is: