NB. without looking at the other solutions...
NB. 25 characters---I made it twice!
%/((+/ .*)~^:4)(1 2,:2 3)
0.618034 0.618034
NB. I can squeeze that to 19 characters
%/+/ .*~^:8>:2[\i.3
0.618034 0.618034
Date: Thu, 25 Feb 2016 02:49:56 -0500
From: "Linda A Alvord"<[email protected]>
To:<[email protected]>
Subject: [Jprogramming] Morning Mystery
Message-ID: <000001d16fa1$1f8ac160$5ea04420$@net>
Content-Type: text/plain; charset="us-ascii"
Using only the single digit counting numbers:
>:i.9
1 2 3 4 5 6 7 8 9
write the shortest possible expression to produce:
0.618034
Linda
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