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A woman died from falling out of a window of a 100-story building and landing on her back, breaking her neck. While they knew it was from a window, they weren't sure which. They also were unsure if this was suicide or murder.

A detective was called and he performed a small experiment.

He went to the second story, opened the window, took out a coin and tossed it out the window, it landed on heads.

He performed this with every window in every story, opening their windows and tossing a coin out, each time landing on heads.

After he performed this with all the windows, he confirmed that this was a murder and not a suicide.

How did he figure this out?

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    $\begingroup$ From 100 stories up, I think a broken neck would be the least of her worries. $\endgroup$ – feelinferrety Oct 6 '17 at 20:49
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Because...

If he "performed this" at all the windows, it means he opened all of them. And if all the windows were closed, this wasn't suicide. She couldn't have closed the window after jumping; the killer tossed her out and closed it. [No idea why the detective had a loaded coin, though. ;)]

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  • $\begingroup$ I think this is the correct answer, so I don't see posting my comment as an "answer;" rather, an observation. Every time he tossed a coin out the window, it "landed on heads." That could mean that there were always people about, since the coin always hit someone's head. and that this happening when no one was there to witness implied murder. (No, it's not a good solution. I just wanted to observe "landing on heads" could be used to mean two distinctly different things. Maybe someone can use that for a riddle someday?) $\endgroup$ – user41265 Oct 5 '17 at 14:41
  • $\begingroup$ Interesting point. I did wonder about the coin; I heard this riddle before TBH, but it's always possible that this is some new twist on it. "Maybe someone can use that" Well, not now that you spoiled the future answer. ;) $\endgroup$ – Walt Oct 5 '17 at 14:53
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    $\begingroup$ I didn't necessarily mean here.. 8-) $\endgroup$ – user41265 Oct 5 '17 at 14:57
  • $\begingroup$ Walt did get the answer correct, but what R. Dye suggested could make a bit of sense. Maybe if the case was that nobody was around to see the dead body and it was discovered later, when every time he dropped the coin, someone went over to see what was going on. It's still wrong as it was sort of tricking about that combined with the fact it brought up how the woman landed on her back, but that is interesting. $\endgroup$ – Caden-Riddles Oct 5 '17 at 16:48

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