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11 December, 18:45

How many positive integers less than 1,000,000 can be written using only the digits 7, 8, and 9?

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  1. 11 December, 19:18
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    The number of integers is

    3+3^2+3^3+3^4+3^5+3^6

    =3 (3^6-1) / (3-1)

    =1092
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