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Permutation and Combination

Q1: In how many ways can the letters of the word 'LEADER' be arranged?

A 72

B 144

C 360

D 720

E None of these

ANS:C - 360

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

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



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