how many 2 will exist in 3 digit number

• Ans is 280
  if 2 is in ones place the 9*10=90
  if two in tens place then 9*10=90
  if two in hundreds place then 10*10=100
  total 100+90+90=280
• 10 years agoHelpfull: Yes(35) No(14)
• Total no of three digit no =9*10*10=900
  Total no of no not having 2= 8*9*9=648
  Therefore required answer is =900-648=252
  Am I right.....plzzz replyyy
• 10 years agoHelpfull: Yes(30) No(11)
• Ans is 278
  if 2 is in ones place the 9*10=90
  if two in tens place then 9*10=90
  if two in hundreds place then 10*10=100
  total 100+90+90=280
  now 222 has been included three times so we subtract 2 form 280
  correct answer will be 278
• 10 years agoHelpfull: Yes(14) No(4)
• Answer is 280
• 10 years agoHelpfull: Yes(3) No(3)
• plzzz explain..i dont get it..
  why we multiply with 9?
• 10 years agoHelpfull: Yes(2) No(2)
• Ans (252)
  Total no of three digit no (Repetition allowed) =9*10*10=900
  Total no of no not having 2(Repetition allowed)= 8*9*9=648
  Therefore required answer is =900-648=252
• 10 years agoHelpfull: Yes(2) No(1)
• 33+66+66+66+3=234
• 10 years agoHelpfull: Yes(1) No(6)
• 271
  9*19+100
• 10 years agoHelpfull: Yes(1) No(2)
• I think 100 t0 999 how many 2 total count
• 10 years agoHelpfull: Yes(1) No(2)
• 300
  because
  between 100-999 or thak 1000
  i.e, first 1000 natural no. every digit appears 300times taking unit,tens nd hundred place
• 10 years agoHelpfull: Yes(1) No(6)
• every digits comes 20 times between 100-199
  so for that from 100 - 999, no of 2 is->20*9=180
  now from 200-299, 2 is 100 times
  so total ans=180+100=280
  
• 10 years agoHelpfull: Yes(1) No(0)
• cn u plz explain more clearly...im nt gettin the solution...
• 10 years agoHelpfull: Yes(0) No(2)
• plz explain me....y multiplying 9 *10
• 10 years agoHelpfull: Yes(0) No(2)
• 279
  252+27=279
• 10 years agoHelpfull: Yes(0) No(2)
• Its 280Ritesh if the question was asked likes how many three digit numbers are there with at least presence of 2 in it then it would be 252 But here the question asked is how many 2s are there So 280
• 10 years agoHelpfull: Yes(0) No(0)
• Total no of three digit no =9*10*10=900
  Total no of no not having 2= 8*9*9=648
  Therefore required answer is =900-648=252
• 8 years agoHelpfull: Yes(0) No(0)