Easy:
A magician shows four fair coins. One is two-headed; the others have both heads and tails.
He places the coins in a black bag and blindly removes one. Repeated flips of the selected coin show "heads".
After how many flips is it safe to bet with even odds that the selected coin has two heads? .

Interesting:
A magician shows four fair coins. Among their eight faces are five heads and three tails.
He places the coins in a black bag and blindly removes one. Repeated flips of the selected coin show "heads".
After how many flips is it safe to bet with even odds that the selected coin has two heads? .

## Question

## bonanova

Bayes, revisited.

- Easy:

- Interesting:

Enjoy!A magician shows four fair coins. One is two-headed; the others have both heads and tails.

He places the coins in a black bag and blindly removes one. Repeated flips of the selected coin show "heads".

After how many flips is it safe to bet with even odds that the selected coin has two heads?

.

A magician shows four fair coins. Among their eight faces are five heads and three tails.

He places the coins in a black bag and blindly removes one. Repeated flips of the selected coin show "heads".

After how many flips is it safe to bet with even odds that the selected coin has two heads?

.

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