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Podcast – 20: The middle digit

by Wes Carroll | Aug 28, 2016 | Podcast | 0 comments

http://www.wescarroll.com/wp-content/uploads/2016/09/20_20The20middle20digit20__.mp3

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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