Aptitude Question: Download Questions PDF
In 80 coins one coin is counterfeit what is minimum number of weighing to find out counterfeit coin?
Answer:
make group of 30 30 and 20 coins
in first weight 30 30
if they are same then coin is in group of 20 if not then it is in lighter one
after one weight u got 30 coins in which lighter is present
in second make three group of 10 10 10 and weight any two group
if both are same then coin is in third one else in a lighter one
after two weight u find 10 coins in which lighter is present
in third
make group of 3 3 4
and weight group of 3 3
if they are differ then u get the three else u get the group of 4
in fourth
if u get three weight any two and find the lighter one
but if u get four there is a need for fifth weight
in first weight 30 30
if they are same then coin is in group of 20 if not then it is in lighter one
after one weight u got 30 coins in which lighter is present
in second make three group of 10 10 10 and weight any two group
if both are same then coin is in third one else in a lighter one
after two weight u find 10 coins in which lighter is present
in third
make group of 3 3 4
and weight group of 3 3
if they are differ then u get the three else u get the group of 4
in fourth
if u get three weight any two and find the lighter one
but if u get four there is a need for fifth weight
Download Aptitude Interview Questions And Answers
PDF