Beholder presents PLANETARIUM a puzzle story

Planetarium Preview Puzzle

The mathemagician tosses a pair of ordinary coins, glances at them and tells you one is a head. What are the odds that the other one is a head, too?

Mathemagician]

Answer:

Obviously 50/50 uh . . . something else

This puzzle is just a warm-up.
It doesn’t form part of Planetarium itself.

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