How many numbers of 4 digits can be formed using integers from 0 to 7 if no digit is to occur more than once in any number?

Options:
1)1470
2)390
3)630
4)560

• at 1000th place we have 7 ways in this place we can put from 1-7 any digit ,"0" cant be placed here because if it will place here than our no will be of 3 digits .
  now at 100th place 0 can be place so again 7 ways.
  At 10th place we have 6 options.
  and at unit place we have only 5 options
  so total ways are=7*7*6*5=1470.
• 13 years agoHelpfull: Yes(2) No(1)
• 7*7*6*5 = 1470 ... option 1
• 13 years agoHelpfull: Yes(1) No(0)