Practical Brain teasers for parents (& kids)
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Speaking of which, can parents solve this completely hypothetical problem?
3 parents want to get into a school with only 2 remaining vacancies. The names of their children are written down and placed in a ballot box.
One of the parents insisted on being the first to draw. The Principal decided to make it more interesting. The parent will get to draw, but if the ballot he opens is his son's name, then his son will be eliminated and the other 2 parents will get the places in the school.
However, before the parent opens the ballot, the Principal will remove one of the remaining 2 ballots in the box that does NOT contain his son's name. The parent will then get to decide to open either the original ballot he removed, or choose to open the last remaining ballot in the box instead.
What should the parent do?
A) Choose to open his original ballot
B) Choose to open the remaining ballot in the box?
C) It makes no difference whether we choose A or B.
:evil: -
Does that mean if he open the ballot with one of the other parent’s kid’s name, that kid will not be able to register with the school ?
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SAHM_TAN:
Does that mean if he open the ballot with one of the other parent's kid's name, that kid will not be able to register with the school ?
Yes, that is right. He and the other parent's kids will get the vacancy. -
ChiefKiasu:
The parent take the ballot from the box or from the P?SAHM_TAN:
Does that mean if he open the ballot with one of the other parent's kid's name, that kid will not be able to register with the school ?
Yes, that is right. He and the other parent's kids will get the vacancy. -
ChiefKiasu:
Chief you testing our IQ ah?Speaking of which, can parents solve this completely hypothetical problem?
3 parents want to get into a school with only 2 remaining vacancies. The names of their children are written down and placed in a ballot box.
One of the parents insisted on being the first to draw. The Principal decided to make it more interesting. The parent will get to draw, but if the ballot he opens is his son's name, then his son will be eliminated and the other 2 parents will get the places in the school.
However, before the parent opens the ballot, the Principal will remove one of the remaining 2 ballots in the box that does NOT contain his son's name. The parent will then get to decide to open either the original ballot he removed, or choose to open the last remaining ballot in the box instead.
What should the parent do?
A) Choose to open his original ballot
B) Choose to open the remaining ballot in the box?
:evil:
Option B of course , if we trust probability. -
SAHM_TAN:
The parent take the ballot from the box or from the P?[/quote]From the box. The one taken by the P has already won a vacancy.ChiefKiasu:
[quote=\"SAHM_TAN\"]Does that mean if he open the ballot with one of the other parent's kid's name, that kid will not be able to register with the school ?
Yes, that is right. He and the other parent's kids will get the vacancy. -
Sun_2010:
Lol. I'm actually testing common sense. If you have any, you will not get the answer correct. For completeness, I have included a third option (C).Chief you testing our IQ ah?
Option B of course , if we trust probability.
I'm not telling the answer yet. What's your rationale for choosing Option B? -
Very stress testing common sense becos I value common sense over IQ LOL.
Hmmmmm I choose A bah -
SAHM_TAN:
Keke... why did you choose A?Very stress testing common sense becos I value common sense over IQ LOL.
Hmmmmm I choose A bah -
I will choose A because 1/3 the chance it is my child's name, if I chose B, the chance is 1/2.
Correct or not?
Not sure if I hope to get the answer right, that means no common sense leh :nailbite:
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