Q: How many 3 digit numbers contain just one 7?

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21

13

90(:

17

18 of them.

-5

-2

1

There are 9000 4-digit numbers. 8*9*9*9 = 5832 of them do not contain a 5 The remaining 3168 contain a 5.

-5

It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.

252

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How many 3 digit numbers contain just one 7?

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