In how many ways can the letters of the word 'LEADER' be arranged?

Answer: Option C

The word 'LEADER' contains 6 letters, namely 1L, 2E, 1A, 1D and 1R.
∴ Required number of ways $$=\frac{6!}{\left(1!\right)\left(2!\right)\left(1!\right)\left(1!\right)\left(1!\right)}=360$$