Tom is trying to open Bob’s computer at office since Bob is on leave. The password consists of digits only and the digits could be from 0-9. He remembers that the password is of 3 digits and no digits repeat. Assume that he gets the correct code only after making all possible attempts. In which attempt does he get the right code?

• In a 3-digit code (digits from 0 to 9), when all digits are different , possible combinations are 10x9x8=720
  As he gets correct code in his last attempt i.e. 720th.
• 5 years agoHelpfull: Yes(11) No(0)
• According to the question, tom gets the correct password of 3 digit number. and all number are different which means we have to apply the permutation and combination concept.
  given numbers are between 0 to 9.
  in this, there is no repetition of numbers.
  so according to concept
  10*9*8=720
  so the code is 720
• 5 years agoHelpfull: Yes(0) No(0)