Question 26
Permutations and CombinationsHow many three-digit numbers can be formed from the digits 2, 3, 4, 5, 6, 7 and 8 if repetition is not allowed?
- A.420
- B.210
- C.70
- D.35
Show the answer and explanation
Answer: B (210)
Explanation
7 choices for the first digit, 6 for the second and 5 for the third: 7 × 6 × 5 = 210.