Question

How many unique ways are there to arrange the letters in the word error

Answer 1

Answer: 20

Step-by-step explanation:

The number of ways to arrange n things in which a things are identical , b things are identical and so on...... is given by :-

$\dfrac{n!}{a!b!......}$

Given Word : ERROR

Total letters = 5

Here letter R is repeated 3 times.

Then, the number of  unique ways to arrange the letters in the word "ERROR " will be :-

$\dfrac{5!}{3!}=\dfrac{5\times4\times3!}{3!}=20$

Hence, the number of  unique ways to arrange the letters in the word "ERROR "=20

Answer 2

They can be arranged 120 different ways