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Hari has been caught stealing cattle, and is brought into town for justice. The judge...........What should Hari choose?

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Hari has been caught stealing cattle, and is brought into town for justice. The judge is his ex-wife Garima, who wants to show him some sympathy, but the law clearly calls for two shots to be taken at Hari from close range. To make things a little better for Hari, Garima tells him she will place two bullets into a six-chambered revolver in successive order. She will spin the chamber, close it, and take one shot. If Hari is still alive, she will then either take another shot, or spin the chamber again before shooting.

Hari is a bit incredulous that his own ex-wife would carry out the punishment, and a bit sad that she was always such a rule follower. He steels himself as Garima loads the chambers, spins the revolver, and pulls the trigger. Whew! It was blank. Then Garima asks, 'Do you want me to pull the trigger again, or should I spin the chamber a second time before pulling the trigger?'

What should Hari choose?

posted Oct 27, 2017 by Madhavi Latha

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1 Answer

+2 votes
 
Best answer

Hari should have Garima pull the trigger again without spinning.

We know that the first chamber Garima fired was one of the four empty chambers. Since the bullets were placed in consecutive order, one of the empty chambers is followed by a bullet, and the other three empty chambers are followed by another empty chamber. So if Hari has Garima pull the trigger again, the probability that a bullet will be fired is 1/4.

If Garima spins the chamber again, the probability that she shoots Hari would be 2/6, or 1/3, since there are two possible bullets that would be in firing position out of the six possible chambers that would be in position.

answer Oct 27, 2017 by Mogadala Ramana



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