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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:
Answer & Solution
Correct Answer:
Option
A
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 − 30240
= 69760
= 69760
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Login26-10= 16
For non repeated = 16 p 5
For repeated= total words - non repeated
= 10^5 - 16 p 5