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9 June, 00:43

How many positive integers less than 1,000 do not have 7 as any digit?

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  1. 9 June, 01:06
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    Calculate the numbers that do have 7 in it.

    1 to 10 : 1

    70 to 79:10

    1 to 100:1*9+10=19

    700 to 799:100

    1 to 999:8*19+100=252

    intergers with no 7=999-252=747
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