In how many ways can the letters of the word LEADER be arranged?
72
144
360
720
Explanation:
The word LEADER contains 6 letters, namely 1L, 2E, 1A, 1D and 1R.
| $\therefore$ Required number of ways =$ \dfrac{6!}{(1!)(2!)(1!)(1!)(1!)} $= 360. |