Question

more logic than maths, but still...

There are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the fake coin?

Answer 1

I don't get the question.

Answer 2

is it less than 3?

Answer 3

how many times do u have to use the scales before u find the fake coin?

Answer 4

@satellite73 it is

Answer 5

hmm then i have more to think

Answer 6

oh ok

Answer 7

got it

Answer 8

@satellite73 spot on, i'd message u back but ur blocked somehow

Answer 9

for anyone else, sattelite's answer was:
2 weighings/ uses
split the coins into three groups of three
weigh two groups of them
this narrows it down to one group of 3

then weigh one and one
if they balance, its the remaining one