1.  In how many ways can the letters of the word 'LEADER' be arranged?
A. 72
B. 144
C. 360
D. 720

Answer: Option C

Explanation:

The word 'LEADER' contains 6 letters, namely 1L, 2E, 1A, 1D and 1R.

Required number of ways = 6!
(1!)(2!)(1!)(1!)(1!)
   
      = 360.