The number of seven digit integer with sum of the digits equal to 10 and formed by using the digits 1,2 and 3 only is

• 3211111 THE SAME NUMBER CAN BE WRITTEN IN 7!/5!WAYS=42 WAYS
• 12 years agoHelpfull: Yes(1) No(1)
• ANS: 42
  
  It is not possible to use 2 or 3 more than once with satisfying the given condition.
  So, remaining 5 places are filled with 1.
  Hence, the 7 digit number is 1111123.
  It can be arranged in 7!/5!=42 ways
• 12 years agoHelpfull: Yes(1) No(0)