# Re: The seven step series

From: m.a. <marty684.domain.name.hidden>
Date: Wed, 8 Jul 2009 21:05:24 -0400

Here's my third try. I'll continue working on the (power x) problem. m.a.
----- Original Message -----
From: Bruno Marchal
To: everything-list.domain.name.hidden
Sent: Wednesday, July 08, 2009 1:31 PM
Subject: Re: The seven step series

On 08 Jul 2009, at 15:43, m.a. wrote:

Second try:
(power {1, 2, 3}) = ? {{ }, {1}, {2}, {3}, {1,2}, {2,3}, {1,2,3}}

Third try:
= {{ }, {1}, {2}, {3}, {1,2}, {2,3}, {1,2,3}, {{ },1,2,3}}

This is far better! Not yet correct though.

I gave you the hint that there are 8 elements. Let us count:

The empty set { } ..................................1
Three singletons {1}, {2}, {3}................3
Two doubletons {1,2 }, {2,3 }................2
The biggest subset {1,2,3}..................1

01 + 03 + 02 + 1 = 7

A subset is missing! Can you see which one?

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Received on Wed Jul 08 2009 - 21:05:24 PDT

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