Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Ten letters of an alphabet are given. Words with five letters are formed by these given letters. Then the number of words which have at least one letter repeated is<stro

Ten letters of an alphabet are given. Words with five letters are formed by these given letters. Then the number of words which have at least one letter repeated is

Option: 1

69760


Option: 2

30240


Option: 3

99748


Option: 4

none of these


Answers (1)

best_answer

Number of five letter words that can be formed from 10 letters

=10 \times 10 \times 10 \times 10 \times 10=10^{5}

Number of five letter words that have none of their letter repeated

={ }^{10} P_{5}=10 \times 9 \times 8 \times 7 \times 6=30240

\therefore  Number of words which have at least one letter repeated

=10^{5}-30240=69760

Posted by

Ritika Jonwal

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

NTA Exam 2025 Live: UGC NET admit card out for all exams; JEE Main session 1 hall ticket soon
anam-khan

SFI protests across Tamil Nadu universities against UGC draft regulations on faculty recruitment
anam-khan

How to get top rank in JEE Main 2025? Last 10-day study plan

Latest Question