In how many ways can the letters of the word PENCIL be arranged so that (i) `N` is always next to `E` ? (ii) `Na n dE` are always together? .

Explanation

(1) If we keep letter N always next to E then they(EN) treated as 1 letter, so we have total 5 letters now then we have by formula
the number of ways of arrangement is`5!`

`\Rightarrow 120`ways

(2) If E and N are always togather then we have number of ways of arrangement

`5!\times 2!`

`\Rightarrow 240`ways