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## #1 2015-06-02 09:46:51

husnain
From: Chichawatni,Pakistan
Registered: 2014-10-03
Posts: 8,129
Website

### Repeated Letter:

Question:
Ten different letters of alphabet are given, words with 5 letters are formed from these given letters. Then, the number of words which have at least one letter repeated is:

Option A):
69760
Option B):
42386
Option C):
99748
Option D):
30240

69760

Explanation:
Number of words which have at least one letter replaced,
= Total number of words - total number of words in which no letter is repeated.
=> 105  16P5.
=> 100000 &#8722; 30240 = 69760.

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