# Re: The seven step series

```Here's my third try. I'll continue working on the (power x) problem.   m.a.
----- Original Message -----
From: Bruno Marchal
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

1 + 3 + 2 + 1 = 7

A subset is missing! Can you see which one?

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