None of the suggested answers are correct. The people who set the questions got it wrong. So the examiners gave everyone a correct score, irrespective of their answer. The correct answer is 4. See https://en.wikipedia.org/wiki/Coin_rotation_paradox
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I was working on a 3 to 1 ratio so will have to go through the answer more indepth when I get chance. Interesting problem, where did you @Baza find that?
I could feel the pressure building, vane creature I am, I just couldn't see it and now feel exhausted! A 4
One of the YouTubers I follow is Veritasium. Always something different, such a collection of esoteric subjects that never cease to interest me.
How a Chinese man may greet you. Or is a Posh school in west London mate…. Not quite a bulls eye : A 3.