+91-87964 74404
FlagBACK
Question icon
Grade 12th passDiscuss with colleagues and IITians

Ten different alphabets are given. Words containing five alphabets are to be formed from them. Find the number of words which have exactly one alphabet repeats.

Profile image of SEELA
8 Years agoGrade 12th pass
Answers icon

1 Answer

Profile image of Arun
8 Years ago
 

total number of words of 5 letter from 10 different letter such that any letter can be repeated any number of time = 105

 

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

Other Related Questions on discuss with colleagues and iitians

question mark
Are core branches(Mechanical) in Top 3 NIT worth it ?
discuss with colleagues and iitians
1 Answer Available

Last Activity: 3 Years ago

question mark
My rank in JEE Advanced 2022 is 1871. Should I go for IIT Guwahati ECE or IIT Kanpur Mechanical and try for a branch change to CS or Electrical Engineering? Is changing your branch very difficult?
discuss with colleagues and iitians
1 Answer Available

Last Activity: 3 Years ago

question mark
Can i sacrifice board exams for jee mains as board exams are no where valueable as cuet and other will be seen for admission 
 
discuss with colleagues and iitians
1 Answer Available

Last Activity: 4 Years ago

question mark
Is a student studying in IGCSE syllabus eligible for taking IOQP or IOQJS?
discuss with colleagues and iitians
1 Answer Available

Last Activity: 4 Years ago

question mark
I have wasted my 11th? Is it still possible to get into my dream iit? Do i have to cover 11 th syllabus first? When and how can i finish it? 
discuss with colleagues and iitians
1 Answer Available

Last Activity: 4 Years ago