How many three-digit numbers satisfy the property that the middle digit is the average of the first and the last digits? // Spiciness: ** out of ****
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- FrequencyMonthly
- Published28 August 2016 at 04:00 UTC
- Length3 min
- RatingClean
How many three-digit numbers satisfy the property that the middle digit is the average of the first and the last digits? // Spiciness: ** out of ****