(Q). In an exam a question paper has 10 questions. What is the total number of ways that a student can answer this paper?
Solution:-
Each question has two ways to answer it either answered or unanswered
∴ total number of ways to attempt question paper = 2¹⁰ = 1024 ways
this also include the 1 case when none of the questions is answered i.e. all questions are answered.
Hence total number of ways = 1024 – 1
= 1023 ways Answer
