1. Sigma

What does sigma mean I maths

2. Re: Gulliver and the King

Hello, baxteryay!

This is based on a classic problem.

He could cut one link like this: . $\subset\!\supset\!\!\!\subset\!\!\supset \;\;\subset\!\supset \;\;\subset\!\!\supset \!\!\!\subset\!\supset \!\!\! \subset\!\supset \!\!\!\subset\!\supset$

Then he can present from 1 to 7 links.

. . $\begin{array}{cc} \text{Number} & \text{Combination} \\ \hline 1 & 1 \\ 2 & 2 \\ 3 & 1+2 \\ 4 & 4 \\ 5 & 1+4 \\ 6 & 2+4 \\ 7 & 1+2+4 \end{array}$

. . up to a maximum of 15 links.