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Four Numbers



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#1 BMAD

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Posted 31 August 2013 - 05:38 PM

I have four positive numbers, a, b, c and d (not necessarily integers).
 
Obviously, there are six ways to multiply pairs of them, yielding the products a*b, a*c, a*d, b*c, b*d and c*d.
 
I tell you what five of these products are (but not which product is what):
2, 3, 4, 5 and 6
 
What's the sixth product?
 
Spoiler for Hint:

Edited by BMAD, 31 August 2013 - 05:38 PM.

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#2 James33

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Posted 31 August 2013 - 07:51 PM   Best Answer

Spoiler for


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#3 Anza Power

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Posted 01 September 2013 - 03:10 PM

Spoiler for

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#4 superprismatic

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Posted 12 September 2013 - 01:01 AM

Spoiler for just to complete this


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#5 vinay.singh84

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Posted 12 September 2013 - 06:12 PM

Spoiler for My quick/elegant way of finding the answer

Edited by vinay.singh84, 12 September 2013 - 06:18 PM.

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