Q. How many integer between 1000 and 10000 having no digit other than 4, 5 or 6

• The integer in between 1000 to 10000 must be 4 digits.
  then no of integer in between 1000 to 10000 having digit 4,5,6 is = 3*3*3*3 = 81.
• 11 years agoHelpfull: Yes(2) No(4)