Ten different letters of an alphabet are given. Words with 5 letters are formed from these given letter. Then, the number of words which have at least one letter repeated is--
A) 69760
B) 30240
C) 99748
D) All of these
Answers
Answered by
27
total number of words of 5 letter from 10 different letter such that any letter can be repeated any number of time = 10^5
total number of words of 5 letter from 10 different letter such that no letter can be repeated = 10 *9*8*7*6
now for atleast one letter is repeated = 10^5 - 10 *9*8*7*6
=69760
total number of words of 5 letter from 10 different letter such that no letter can be repeated = 10 *9*8*7*6
now for atleast one letter is repeated = 10^5 - 10 *9*8*7*6
=69760
Answered by
4
d all of these
as 6 has been repeated in 1st
0 has been repeated in 2nd.
9 has been repeated in 3rd...
it's best answer and correct also.
I'm sure please mark it as brainlist
as 6 has been repeated in 1st
0 has been repeated in 2nd.
9 has been repeated in 3rd...
it's best answer and correct also.
I'm sure please mark it as brainlist
Similar questions
total number of words of 5 letter from 10 different letter such that no letter can be repeated = 10 *9*8*7*6
now for atleast one letter is repeated = 105 - 10 *9*8*7*6
=69760