Consider all possible permutations of the letters of the word `ENDEANOEL`. The number of permutations containing the word ENDEA is

Options

A. 5!
B. `2xx5!`
C. `7xx5!`
D. `21xx5!`

Explanation

To find the number of permutations of the letters in the word "ENDEANOEL" that contain the substring "ENDEA", we can follow these steps:

### Step 1: Treat "ENDEA" as a single unit
Since we want to count permutations that contain the substring "ENDEA", we can treat "ENDEA" as a single letter or unit. This simplifies our problem.

### Step 2: Identify remaining letters
After treating "ENDEA" as a single unit, we need to identify the remaining letters in "ENDEANOEL". The letters we have are:
- "ENDEA" (treated as one unit)
...