Question 14
Permutations and CombinationsGiven that n = 3, evaluate 1/(n − 1)! − 1/(n + 1)!
- A.12
- B.2½
- C.2
- D.11/24
Show the answer and explanation
Answer: D (11/24)
Explanation
1/2! − 1/4! = 1/2 − 1/24 = 11/24.
Given that n = 3, evaluate 1/(n − 1)! − 1/(n + 1)!
Answer: D (11/24)
1/2! − 1/4! = 1/2 − 1/24 = 11/24.