JAMB Mathematics 2018 Objective — Question 7
Question 7 of 39 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
Advertisement
An examiner has five envelopes labeled A to E for each of the five options of a question paper. In how many ways can the examiner place one option of the question paper in each envelope without getting every option in its matching envelope?
- A. 119Correct
- B. 120
- C. 24
- D. 25
Explanation
Total arrangements of 5 items = 5! = 120. Excluding the single arrangement where every option matches its own envelope leaves 120−1 = 119.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.