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01 Dec 2014, 15:24
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
25% (02:08) correct
75%
(02:57)
wrong
based on 4
sessions
History
Date
Time
Result
Not Attempted Yet
You are given two stones, and access to a 100-storey building. Both stones are identical. The aim is to find out the highest floor from which a stone will not break when dropped out of a window from that floor. If a stone is dropped and does not break, it is undamaged and can be dropped again. However, once a stone is broken, that’s it for that stone.
If a stone breaks when dropped from floor n, then it would also have broken from any floor above that. If a stone survives a fall, then it will survive any fall shorter than that.
How many minimum tries do you need to find from which floor the stone will start breaking?
1. 50
2. 25
3. 32
4. 15
5. 14
got it right, but still would like to know the ideas from others.
If a stone breaks when dropped from floor n, then it would also have broken from any floor above that. If a stone survives a fall, then it will survive any fall shorter than that.
How many minimum tries do you need to find from which floor the stone will start breaking?
1. 50
2. 25
3. 32
4. 15
5. 14
got it right, but still would like to know the ideas from others.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
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Thank you for understanding, and happy exploring!
01 Dec 2014, 23:59
Kudos
Bookmarks
santorasantu
Moderators: Is this a GMAT question?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
