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**Deku Trii** · 06-23-2009, 02:43 PM

Monty Crawl

Spoiler Below

If he opens the lower numbered door, as he will 2/3 of the time, you win by switching 50% of the time. If he opens the higher numbered door, as he will 1/3 of the time, you win by switching 100% of the time. So you win by switching 1/3*1+1/2*2/3=2/3.

06-23-2009, 02:43 PM	#3
Deku Trii PP&R Mod Current Events Mod Join Date: Jun 2000 Location: Texas Gender: Posts: 9,029 Thanks: 521 Thanked 1,098 Times in 582 Posts	Monty Crawl Spoiler Below If he opens the lower numbered door, as he will 2/3 of the time, you win by switching 50% of the time. If he opens the higher numbered door, as he will 1/3 of the time, you win by switching 100% of the time. So you win by switching 1/31+1/22/3=2/3.