If abc is 3-digit no. Have values a,b,c..
Calculate all the values havng atleast two of three digits are same??

1).240
2).248
3).252
4).266

• 3 digit repeat-9*10*10=900
  none digit repeat-9*9*8=648
  900-648=252(atleast 2 digit repeat)
• 10 years agoHelpfull: Yes(53) No(1)
• No.of 3digits numbers with repetition = 9*10*10=900
  No.of 3digits numbers without repetition = 9*9*8=648
  So ans is 900-648=252
• 10 years agoHelpfull: Yes(15) No(0)
• yes there is atleast two digits r same .. and ans is 252
• 10 years agoHelpfull: Yes(6) No(0)
• answer: 252
  from 100-199 there r 28 number having atleast two digit same.
  so; 28*9= 252
• 10 years agoHelpfull: Yes(4) No(0)
• for 0
  100,200,300,400,500,600,700,800,900 = total 9
  
  for 1
  101,110,111,112,113,114,115,116,117,118,119,121,131,141,151,161,171,181,191,211,311,411,511,611,711,811,911 = total 26
  
  so we need 3 digit no. means we can take up to 9. for each no the possibilty is 26 like that upto 9
  26*9=234
  and add the possibility of 0 also that means 234+9=243.
  
  Ans is 243
• 10 years agoHelpfull: Yes(4) No(2)
• 252
  
• 10 years agoHelpfull: Yes(3) No(0)
• 3c2*9*8=216(2 are same)
  other 36(110,101,011,111 all has 9 combinations so 4*9=36)
  216+36=252
  
• 10 years agoHelpfull: Yes(3) No(1)
• Are you sure there is "atleast two digits"?? Because i attempted this question, and the question was "having two of three digits are same"....so in this case ans is 243
• 10 years agoHelpfull: Yes(2) No(3)
• 252 n 266 both have two digits same........
• 10 years agoHelpfull: Yes(2) No(0)
• ans will be 243
  Expl
  
  first we concider only 1-9
  3 digit no where two digit same and one different =3c2*9*8=216 ;
  where 3c2=number of arrangement where two digit same and one different
  
  second 0 in the middle position =9
  3rd 0 in the right most posi =9
  total=234 ,this is total of two digit same
  
  now all the three digit same
  that will be 111,222,333,........=9
  
  so at least two digit same =234+9=243 ans
  
• 10 years agoHelpfull: Yes(2) No(7)
• question is saying at least 2 digit same not only 2 digit same ..:)
  
  first calculate 2 digit same then calculate 3 digit same.
  then add both of these.
  
• 10 years agoHelpfull: Yes(2) No(0)
• count for 100 to 199
  then multiply with 9;
  here from 100 to 199 there will be :
  
  101,111,112,113,114,115,116,117,118,119,
  121,131,141,151,161,171,181,191,
  110,
  122,133,144,155,166,177,188,199
  so total =27*9=243
  and add number of number :
  
  100,200,300,400,500,600,700,800,900
  
  so the final answer will be: 243+9=252
• 9 years agoHelpfull: Yes(2) No(0)
• (3) 252 is the correct answer.
• 9 years agoHelpfull: Yes(1) No(0)
• how ? 266 also have 2 digits same
• 10 years agoHelpfull: Yes(0) No(3)
• 252
  243+9 where from 110 to 990 243 erms + 9 terms for 100 ,to 900 all terms having two zero
• 9 years agoHelpfull: Yes(0) No(0)
• ans will be 252
• 9 years agoHelpfull: Yes(0) No(0)