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M07-35
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HWPO
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Re: M07-35 [#permalink] New post  25 Nov 2020, 16:27
chetan2u wrote:
UNSTOPPABLE12 wrote:
Bunuel chetan2u
Hello,
After reading all the above questions/answers I still have trouble understanding this problem.
The way I see it, is that in order to guarantee that we will pick 2 chips of the same color then we should pick 17 pieces (worst scenario would be picking all 15 blacks) so the correct answer, as per my understanding would be A , so what is the flaw of my approach?



Hi,
There are only two colours and that is the thing which is important. How many each colour really does not affect the answer.
You pick W, next has to be B or W. worst case it is B, so W, B, _.
Now the next has to be B or W, so whatever it is, we will surely have 2 of some colour, W or B.
Say there were 15 colours and we were to talk of this answer, then answer would be 16.


I agree with chetan2u, why is it the worst case if we pick 1black and 1white?

Why isn't the worst case when all that we pick is of the SAME color ? This is why the question is referring to the "least" number in order to avoid such scenario in which all we pick is of the SAME color.

It is not?

Bunuel
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Ahmed9955
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Re: M07-35 [#permalink] New post  15 Mar 2021, 10:04
Bunuel wrote:
There are 15 black chips and 5 white chips in a jar. What is the least number of chips we should pick to guarantee that we have 2 chips of the same color?

A. 19
B. 16
C. 6
D. 5
E. 3


hi Bunuel can you provide a link for more questions like this?
Thanks.
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Bunuel
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Re: M07-35 [#permalink] New post  15 Mar 2021, 10:20
Expert Reply
Ahmed9955 wrote:
Bunuel wrote:
There are 15 black chips and 5 white chips in a jar. What is the least number of chips we should pick to guarantee that we have 2 chips of the same color?

A. 19
B. 16
C. 6
D. 5
E. 3


hi Bunuel can you provide a link for more questions like this?
Thanks.


Check other Worst Case Scenario Questions from our Special Questions Directory to understand the concept better.
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Re: M07-35 [#permalink]
15 Mar 2021, 10:20
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