There are 50 questions in a paper. Find the number of ways in which a student…
2021
There are 50 questions in a paper. Find the number of ways in which a student can attempt one or more questions:
Answer: A. 2⁵⁰ - 1 — Each of the 50 questions can either be attempted or not attempted, giving 2^50 subsets of questions. Excluding the case where no question is attempted leaves…
- A.
2⁵⁰ - 1
- B.
2⁵⁰ + 1
- C.
2⁵⁰ - 2
- D.
2⁵⁰ + 2
Attempted by 9 students.
Show answer & explanation
Correct answer: A
Each of the 50 questions can either be attempted or not attempted, giving 2^50 subsets of questions. Excluding the case where no question is attempted leaves 2^50 - 1 ways.
Loading lesson…