how many whole numbers between 100 and 400 contain the digit 2 in their standard notation????????

• answer is
  102,112,121,,,,,,,,,,,,,129,132,142,152,162,172,182,192 such type of number in is 17 there
  so such type of 3*17=51.
  200 to 299= 99 numbers
  thn total numbers=51+99=150,
  so answer is 150
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