rocdocmac

Is ... (1) Flippping allowed? (2) Monomino allowed?

Looks neater and much better ordered. Only slightly more than 1 % increase in space! Thanks.

A picture ...

There are five people in a room, someone came and killed four. How many remains?

CaptainEd ...

Should have said "isocagon" in the OP is wrong - icosagon in the title needs no change. Double dyslexia!!

Thanks!

Sorry for the "icosagon" in the title! Should read isocagon. 'Twas a dyslexic moment!

(a) If an ant is placed on each vertex of a regular isocagon, what is the probability that there will be no encounter between any two ants if all ants start moving simultaneously and randomly (either clockwise or anti-clockwise) along the edge to the next vertex without changing direction? What are the chances of no encounter if there are … (b) Four ants, each placed on the vertices of a tetrahedron? (c) Eight ants, starting at the corners of a cube?

Trust so too! BN ... is there a way to work it out mathematically? I don't think that logarithms will suffice!

Looks like cheerio to this one!

Merci beaucoup Harey et bonne nuit ...

@harey... Êtes-vous Franҫais?

The needle goes down 12.5 mm to the very beginning of the first song, i.e. before the first song actually starts.