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Lucía's Odd Product (Posted on 2024-05-24) Difficulty: 3 of 5
Lucía multiplies some positive one-digit numbers (not necessarily distinct) and obtains a number n greater than 10. Then, she multiplies all the digits of n and obtains an odd number. Find all possible values of the units digit of n.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Puzzle ThoughtsK Sengupta2024-05-29 00:28:58
ConjectureJer2024-05-24 09:43:00
Some ThoughtsComputer exploration without proofLarry2024-05-24 09:20:55
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