how many 4 digit nos are there which have digits 1,2,3,4,5,6,7 and 8 such that digit 1 appears only once?

• two cases
  1) digit 1 included: numbers= 1*7*7*7=343
  2) digit 1 not included: numbers=7*7*7*7=2401......bcoz repetition is allowed
  
  so total= 343+2401=2744 numbers are possible
  
• 11 years agoHelpfull: Yes(0) No(1)
• ans is 249
• 11 years agoHelpfull: Yes(0) No(2)
• ans is 4.7^3 but how??
• 11 years agoHelpfull: Yes(0) No(1)