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M07-18

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M07-18  [#permalink]

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New post 08 Apr 2019, 18:31
alikm wrote:
why are we assuming that there is only 2 types of snakes in the box?



There is no need to assume that there are only 2 types of snakes while reading the main statement. However when you apply the first condition, the assumption of more than 2 types of snakes is eliminated. Because if there were 3 types of snakes there is no way to ensure that there is 1 viper among the 2 snakes are selected.

A thing to keep in mind is that the question isn't asking to determine whether there will be 1 viper among the 2 snakes selected. It is a condition applied to the main statement.
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Re: M07-18  [#permalink]

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New post 24 Apr 2019, 09:47
This is more of a puzzle than a Quant problem, but its good to know what the wordings imply:
"From any two snakes from Pandora's box at least one is a viper"
Implies for any combination of two snakes we can never have two Cobras. This can only happen if there is 1 cobra.
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Re: M07-18  [#permalink]

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New post 10 Jul 2019, 02:29
You can look at this if there are X snakes in Pandora's Box and as per statement 1 if you take out any two snakes out of X there can be at least 1 viper.

Now what does that mean : That mean you can have 1 viper and 1 cobra or 2 vipers in any two pairs chosen from Pandora's Box.
That means there cant be two cobras in any pair chosen. That will violate the statement one. and as per question stem there is at least one cobra that confirms that there can be at most one cobra only.
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M07-18  [#permalink]

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New post 27 Jul 2019, 09:34
Analysis: (I got this wrong, i read the previous posts and answers, re-illustrated and now I finally understood. :shocked :shocked :shocked :shocked :shocked Thanks for this wonderful Tricky question)


Question stem says, at least one cobra and one viper

Stmt 1 says,
At least one viper when you pick ANY two snakes

So the Combination of two snakes are :
VV - OK
VC - OK
CV - OK
CC - This is not possible, since there must be at least one Viper in a pair of snakes

=====================================================================

Case 1:
V V V V V V
V V C V V V
V V V V V V
In case 1, I could get only the following combinations
VV - OK
VC - OK
CV - OK
(Therefore, this is exactly what was mentioned in the question stem and statement 1)


Case 2:
V V V V V V
V C C V V V
V V V V V V
In case 2, I could get all the following combinations
VV - OK
VC - OK
CV - OK
CC - This is not possible, since there must be at least one Viper in a pair of snakes
(Therefore, this is NOT what was mentioned in the question stem and statement 1)


YOU CAN HAVE ONLY one COBRA as in CASE 1


=====================================================================

in statement 2, the total snakes are 99.
So i could have any combinations of snakes As long as at least one cobra and at least one viper as mentioned in the question stem

98C + 1V
91C + 8V

So, statement 2 is not useful at all.
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Re: M07-18  [#permalink]

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New post 03 Aug 2019, 22:15
I honestly don't think many people got this right. A lot of the responses in this thread are merely justifications.
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Re: M07-18   [#permalink] 03 Aug 2019, 22:15

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