select the correct answer.\nconsider the word...
select the correct answer.\nconsider the word pencil. if all of the letters are used, and the first letter cant be n or l, how many ways can the letters be arranged?\na. 720\nb. 480\nc. 360\nd. 96
Answer
# Explanation:
## Step1: Determine first - letter possibilities
The word "pencil" has 6 letters. The first letter can't be N or L, so there are 4 choices (p, e, c, i) for the first - letter.
## Step2: Determine arrangements of remaining letters
After choosing the first letter, there are 5 remaining letters. The number of arrangements of these 5 remaining letters is \(5!\) (the number of permutations of 5 distinct objects), and \(n!=n\times(n - 1)\times\cdots\times1\), so \(5!=5\times4\times3\times2\times1 = 120\).
## Step3: Calculate total arrangements
By the multiplication principle, the total number of arrangements of the 6 - letter word with the given condition is \(4\times5!\).
\[4\times5!=4\times120 = 480\]
# Answer:
B. 480