2 min
20: The middle digit [**] Wes Carroll's Puzzler
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- Education for Kids
How many three-digit numbers satisfy the property that the middle digit is the average of the first and the last digits?
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Spiciness: ** out of ****
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 ****
2 min