## Welcome to BrainDen.com - Brain Teasers Forum

 Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account. As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends. Of course, you can also enjoy our collection of amazing optical illusions and cool math games. If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top. If you have a website, we would appreciate a little link to BrainDen. Thanks and enjoy the Den :-)
Guest Message by DevFuse

# jmaurier

Member Since 20 Dec 2012
Offline Last Active Dec 20 2012 09:40 AM

### In Topic: Weighing in a Harder Way

20 December 2012 - 09:37 AM

minimum 3 max 6 (If you are splitting into 3 piles each time).

incase you don't know: "!=" means "not equal"

BEST CASE = 3 tries

1)if A=B then the coin is in C. Split C into three piles (again A,B,C)

2)if A=B then the coin is in C again. Split C into the three last coins.

3)if A=B then C is the coin.

WORST CASE = 6 tries

1)A!=B   (piles of 9)

2)Now test A and C

if A=C then split B into ABC

if A!=C then split A into ABC

3)A!=B   (piles of 3)

4)Now test A and C

if A=C then split B into ABC

if A!=C then split A into ABC

5)A!=B   (last 3 coins)

6)Now test A and C

if A=C then B is the coin

if A!=C then A is the coin