The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

Ghost Post · Icarian Member

This puzzle is confusing, however the proper answer to the question of probabilty on the morning (or two mornings) after the event can only be 100% or zero. Putting SB to sleep didn't affect or change the outcome of the coin flip

Brillo · Daedalian Member

A comment or puzzle? I'm confused. Can you provide more info?

Ghost Post · Icarian Member

The question asks what the probabilty WAS that the coin came up heads. If i flip a coin now and look at the outcome, the probablity that it came up heads was still 50%, even after the coin flip.

Ghost Post · Icarian Member

Actually, the problem stated that they asked her what the probability was that the coin came up heads.

If you say that I asked you what the probability was, you can answer either .5 or 1, depending on when you believe my time reference dealt with.

Ghost Post · Icarian Member

On sunday I flipped some coins.

If I flipped one coin, I'll only ask you on monday what the odds are that one coin came up heads.

If I flipped two coins, I'll ask you on monday and tuesday what the odds are that one coin came up heads.

You have a very bad memory, never know what day it is, and wont remember if you've been asked before. In fact, you'll barely remember the question that I just asked you, let alone something that happened many hours ago.

Being a strong puzzler, how would you answer the question? What are the odds that one of the coins I flipped came up heads?

Nick

Amy · Daedalian Member

I'll always say 50%, since I won't remember the parameters of the puzzle. Felicitous