Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • How many ways are there to write a 4-digit positive integer using the digits 2, 3, 4, 6, and 8 if no digit is used more than once?  Opti

How many ways are there to write a 4-digit positive integer using the digits 2, 3, 4, 6, and 8 if no digit is used more than once?

 

Option: 1

120


Option: 2

180


Option: 3

360


Option: 4

480


Answers (1)

best_answer

Since we can choose from the five available digits, we have five options for the first digit. 

Similarly, because we have used up one of the digits, there are four options for the second digit and three options for the third digit. 

Again 2 options are available for the fourth digit.

So the total number of ways to write a 4-digit positive integer using the digits 2, 3, 4, 6, and 8 is,

\mathrm{ 5\times 4\times 3\times 2=120}

Therefore, there are 120 ways to write a 4-digit positive integer using the digits 2,3,4,6, ad 8 if no digit is used more than once.

 

Posted by

mansi

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

JEE Main Marks vs Percentile 2025: How many marks do you need to score 95+ percentile?
anam-khan

JEE Main 2025 session 1 official answer key out; challenge by February 6; how to calculate NTA score?
anam-khan

JEE Main 2025: NIT Raipur's CSE cut-offs drop; closing ranks in popular branches

Latest Question