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Normal full-term babies are all born with certain

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Normal full-term babies are all born with certain [#permalink]

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New post 25 Jun 2009, 03:09
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Normal full-term babies are all born with certain instinctive reflexes that disappear by the age of two months. Because this three-month-old baby exhibits these reflexes, this baby is not a normal full-term baby.
Which one of the following has a logical structure most like that of the argument above?
(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky.
(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk.
(C) Because humans are social animals and Henry is sociable, Henry is normal.
(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum.
(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal.
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Re: Babies [#permalink]

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New post 25 Jun 2009, 04:08
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Let "Normal full-term babies" be X
and let "certain instinctive reflexes that disappear by the age of two months" be Y
So argument is something like
All X have property Y. If Y not present, this baby is not X.

We need to select an option matching the above structure.

(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky. -different structure -X have property Y. Z doesn't have property Y
(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk. -different structure -X have property Y. Suzy is X, and hence has property Y
(C) Because humans are social animals and Henry is sociable, Henry is normal. -incorrect comparison of Henry with Normal
(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum. -Correct, same structure as given in argument. All X have property Y. If Y not present, this animal is not X.
(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal. -option doesn't say that "normal" tree sheds leaves. So cannot conclude the tree not shedding leaves in not normal

IMO D
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Re: Babies [#permalink]

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New post 25 Jun 2009, 04:58
Yes, even I think it's D.

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Re: Babies [#permalink]

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New post 25 Jun 2009, 07:02
bigoyal wrote:
Let "Normal full-term babies" be X
and let "certain instinctive reflexes that disappear by the age of two months" be Y
So argument is something like
All X have property Y. If Y not present, this baby is not X.

We need to select an option matching the above structure.

(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky. -different structure -X have property Y. Z doesn't have property Y
(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk. -different structure -X have property Y. Suzy is X, and hence has property Y
(C) Because humans are social animals and Henry is sociable, Henry is normal. -incorrect comparison of Henry with Normal
(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum. -Correct, same structure as given in argument. All X have property Y. If Y not present, this animal is not X.
(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal. -option doesn't say that "normal" tree sheds leaves. So cannot conclude the tree not shedding leaves in not normal

IMO D


Nicely explained. Agree with D
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Re: Babies [#permalink]

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New post 25 Jun 2009, 11:20
Will go with D as well....
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Re: Babies [#permalink]

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New post 27 Jun 2009, 16:52
I'm with D too.

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Re: Babies   [#permalink] 27 Jun 2009, 16:52
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