JAMB Mathematics 2021 Objective — Question 28
Question 28 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.
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28. How many three-digit numbers can be formed from 12345 without repeating any digit? (a) 60 (b) 120 (c) 50 (d) 80
- A. 60Correct
- B. 120
- C. 50
- D. 80
Explanation
This is a permutation of 5 digits taken 3 at a time: ⁵P₃ = 5!/(5-3)! = 5×4×3 = 60.
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