1,504 views
2 votes
2 votes
find number of 7 digit number with sum of digits  equal to  11 and formed using digits 1 ,2 ,3

1 Answer

Best answer
7 votes
7 votes

Sum is 11 = (3,3,1,1,1,1,1) , (3,2,2,1,1,1,1) , (2,2,2,2,1,1,1)

No of combinations : 7!/2!5!  + 7!/2!4!  + 7!/3!4! 

selected by

Related questions

0 votes
0 votes
1 answer
1
Lakshman Bhaiya asked Oct 30, 2018
1,182 views
Let us call a -digit number cool if each of its digits is no less than the preceding digit. How many cool $6-$digit numbers are there?Details And Assumptions:For example,...
1 votes
1 votes
2 answers
2
. asked Mar 26, 2017
943 views
Suppose there are n positive real numbers such that their sum is 20and the product is strictly greater than 1. What is the maximum possiblevalue of n?(A) 18 (B) 19 (C) 20...
0 votes
0 votes
1 answer
4
gate_forum asked Jan 9, 2016
1,598 views
total possible 4 digit numbers from 2,3,5,6,7,9 without repetition? total numbers possible less than 500?360, 130 360, 100 240, 120 ...