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My four numbers (Posted on 2016-02-24) Difficulty: 3 of 5
I have in mind 4 positive numbers, which I would like you to find.

Out of the set of 6 pair-wise products of those numbers I am going to omit one.

The remaining five are: 8,10,12,24,30.

See The Solution Submitted by Ady TZIDON    
Rating: 4.3333 (3 votes)

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Solution solution -- spoiler | Comment 1 of 12
The 8 must be 1*8 or 2 * 4.

If it were 1*8, there'd be a 3 for the 24, the only other multiple of 8 there. But you also need a 2 and a 5 for the 10.

So there are 2, 4 and 5. To get the 30 you also need a 6.

The numbers are 2, 4, 5 and 6. The missing product is 5 * 4 = 20.

Edited on February 25, 2016, 7:55 am
  Posted by Charlie on 2016-02-24 12:18:06

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