How many four digit no that do not contan the digits 3 or 6 arethere

• ans is 3584.
  4 digit no is formed using 0 - 9(10 nos)
  if no start with 0 then it is a 3 digit no.
  so we have 7 possible no out of 10 nos(excluding 0,3,6)= 7
  in 2nd digit we have 8 possible out of 10 nos =8
  in 3rd digit we have 8 possible out of 10 no=8
  in 4th digit we have 8 possible out of 10 no=8
  so, there fore =7*8*8*8=3584
  ans is 3584
  7
• 10 years agoHelpfull: Yes(55) No(0)
• 7*8*8*8=3584
• 10 years agoHelpfull: Yes(12) No(2)
• 1 no= 7 possibilities excluding(0,3,6)
  2nd no=8 possi exc(3,6)
  3rd no= 8 possi exc(3,6)
  4rd no= 8 possi exc(3,6)
  7*8*8*8=3584..
  but can anyone explain me that what will be the result of same ques when "or" is replaced by "and"???
• 10 years agoHelpfull: Yes(5) No(0)
• Total 8 digits(excluding 3 and 6)
  Thousands position is filled in 7 ways(excluding 0)
  Hundredth Position is filled in 8 ways
  Tenths position is filled in 8 ways
  Finally Units position is filled in 8 ways
  So totally 7*8*8*8 = 3584 ways...
• 10 years agoHelpfull: Yes(4) No(0)
• which contain 3or 6=7*8*8*8=3584
  contain=9000-3584=5416
• 10 years agoHelpfull: Yes(2) No(6)
• 7*8*8*8=3584
• 10 years agoHelpfull: Yes(2) No(0)
• in question 3 or 6 digit not allowed in 4 digit number
  
  therefore 8*9*9*9=5832
  [1,2,4,5,7,8,9,(3,6)]*[1,2,4,5,7,8,9,0,(3,6)]*[1,2,4,5,7,8,9,0,(3,6)]*[1,2,4,5,7,8,9,0,(3,6)] = 5832
• 10 years agoHelpfull: Yes(2) No(4)
• There are 0-9 digits now in question 3 or 6 are not there so 7*8*8*8
• 10 years agoHelpfull: Yes(1) No(0)
• 4 digit number
  at unit place we use 8 digit
  ten place we use 8 bits
  at hundred place we use 8 digit
  at thousand place we can use only 7 digit because 0 is not added
  lets answer is (8*8*8*7)=3584
• 10 years agoHelpfull: Yes(1) No(0)
• there will be 7 choice for first place,8 for the rest 3 places so the answer
  should be 7*8*8*8=3584
• 10 years agoHelpfull: Yes(0) No(0)
• 39.6 is the correct answer
• 10 years agoHelpfull: Yes(0) No(0)
• 3581 number's are there !!!
• 10 years agoHelpfull: Yes(0) No(0)