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Two Forex traders are trying to communicate about their trades.
They send each other images with a hidden meaning like this one:

enter image description here

Can you work out which currencies they are trading?

Hint:

There's more than one way to describe a graph

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  • $\begingroup$ Can we have a hint? $\endgroup$ Dec 14, 2020 at 21:59
  • $\begingroup$ rot13(Vf gur rqtr sebz 5 gb 3 zrnag gb or gurer? Bgurejvfr, gur nqwnprapl zngevk ebhtuyl ybbxf yvxr gur flzoby sbe ehcrr.) $\endgroup$
    – E-A
    Dec 14, 2020 at 22:27

1 Answer 1

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You learn something new every day! The currencies they are exchanging are:

The British pound and the American dollar

Reasoning:

Represent the given graph with an adjacency matrix, so the entry in row 𝑖 and column 𝑗 is a 1 if and only if there is an edge from node 𝑖 to node 𝑗, and zero otherwise. Doing this gives the matrix:

$$\begin{matrix} 0 & 0 & 0 & 1 & 1\\0 & 0 & 0 & 0 & 1\\0 & 0 & 0 & 1 & 0\\0 & 1 & 1 & 0 & 0\\0 & 0 & 1 & 0 & 1\end{matrix}$$

Looking at the rows as binary numbers, and converting them to letters with A1Z26 yields the word CABLE. Per Wikipedia (so it must be true), "Cable (or the cable) is a foreign exchange term used for the GBP/USD currency pair rate (British pound priced in US dollars)."

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    $\begingroup$ This is clever! $\endgroup$ Dec 16, 2020 at 21:24
  • $\begingroup$ Well done! I was worried it was too tricky. $\endgroup$
    – flinty
    Dec 17, 2020 at 1:40
  • $\begingroup$ Nice work! I thought there will be a character encoded in the binary matrix image and got stuck. $\endgroup$ Dec 17, 2020 at 10:14

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