How many 7 digit number contain number 3 ?	Choose the correct answer
A) 2748472	B) 3748472	C) 4748472	D) 5748472	E) 6748472
total 7 digit no. = 9*10*10*10*10*10*10= 
<gadget id="calculator">9*10*10*10*10*10*10</gadget>
<output>9_000_000</output>
9000000   not containing 3= 8*9*9*9*9*9*9= 
<gadget id="calculator">8*9*9*9*9*9*9</gadget>
<output>4_251_528</output>
4251528   total 7 digit number contain 3= 9000 - 4251528 = 4748472   ANSWER:4748472
<result>C</result>
How many 7 digit number contain number 3 ?