IBM Interview Question
Web:
www.ibm.com
|
HQ:
Armonk, NY
Overview |
| |
Salaries |
| |
Reviews |
| |
Interviews |
| |
Photos |
| |
Jobs |
| |
|
552 Interview Reviews |
Back to all IBM Interview Questions & Reviews
Interview questions and reviews posted anonymously by interview candidates
Interview Question for Support Job at IBM:
Feb 1, 2010
There are eight silver coins and one counterfeit coin. that looks like a silver coin but actually weighs slightly less than the others. By using a balance scale to compare coins (or groups of coins) whats the minimum number of times you have to use the scale to guarantee that you find the lightest coin? Explain your answe
Add Tags
[?]
Helpful Question?
Yes |
No
Inappropriate?
Answers & Comments (3)
Feb 21, 2010
Answer is 2.
9 coins - 3 groups of 3 coins, 2 group on the scale. If same weight then counterfeit is on the 3rd group.
That left 3 coins. Same concept. 2 coins on the scale...
9 coins - 3 groups of 3 coins, 2 group on the scale. If same weight then counterfeit is on the 3rd group.
That left 3 coins. Same concept. 2 coins on the scale...
Helpful Answer?
Yes |
No
Inappropriate?
Mar 8, 2010
The best case scenario. Minimum requirement is first set of coins. If one of them is lower in weight than other, that indicates, you got the coin with fault.
Helpful Answer?
Yes |
No
Inappropriate?
Members can
answer or comment on this question
–
Join Now (It's Free) or
Sign In
You might also be interested in: Interview Questions, Support Job Interview Questions, IBM Interview
0 of 0 people found this helpful
by Magnsu: