How many 6 digit telephone numbers can be formed if each number starts with 35 and no digit appears more than once?

Options
1) 720
2) 360
3) 1420
4) 1680

• the first two digits are fixed. so the rest of the 4 digits can be chosen from 8 remaining digits.
  
  so ans is 8P4= 1680
• 9 years agoHelpfull: Yes(12) No(1)
• Ans : 4)1680
  
• 9 years agoHelpfull: Yes(2) No(1)
• 8*7*6*5=1680
• 8 years agoHelpfull: Yes(2) No(0)
• 1680 ans.
  selection 4 numbers out of 8 numbers(0,1,2,4,6,7,8,9) =8C4
  now arrange these 4 numbers by 4! .
  (8C4) * 4! = 1680
• 2 years agoHelpfull: Yes(0) No(0)