You have ten coins, but two are fake, and weigh a little less. How many times do you have to use a two arm scale, in order to pick out the two fakes?

The two arm scale must be used at least 5 times  in order to pick out the two fakes.

Edited on February 13, 2023, 9:58 am

Posted by K Sengupta on 2009-01-09 12:41:16