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Between 200 and 400 there are 18 whole numbers that contain the digit 7 once and only once: 207, 217, 227, 237, 247, 257, 267, 287, 297, 307, 317, 327, 337, 347, 357, 367, 387, and 397.

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Q: If you write all the whole numbers from 200 and 400 then how many of these contain the digit 7 once and only once?
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