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Radon-210 is more radioactive than Technetium-99. Since Promethium-61

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Radon-210 is more radioactive than Technetium-99. Since Promethium-61  [#permalink]

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New post 04 Sep 2015, 03:14
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Question Stats:

75% (01:40) correct 25% (01:56) wrong based on 277 sessions

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Radon-210 is more radioactive than Technetium-99. Since Promethium-61 is more radioactive than Protactinium-234, it follows that Radon-210 is more radioactive than Protactinium-234.

Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:

A) Technetium-99 is more radioactive than Promethium-61.
B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
C) Promethium-61 and Radon-210 have equal levels of radioactivity.
D) Promethium-61 is more radioactive than Radon-210.
E) Technetium-99 is more radioactive than Protactinium-234.

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Re: Radon-210 is more radioactive than Technetium-99. Since Promethium-61  [#permalink]

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New post 04 Sep 2015, 03:34
here we can use mathematical skills
radon210>tech..99

since prome61>pro..234.

radon 210>pro..234.

option A tech 99>pro,,61. so tech 99>pro 234.
radon 210>tech 99. it is correct.

option B pro 61=tech99. => tech 99>pro 234.

option c pro 61=radon 210.
pro 61>pro..234, then radon 210>pro..234.


Option d pro 61>radon 210

pro 61>prom234. here we cant deduce any referece.

radon210 can be> prom 234. or radon 210=prom 234. or prom234 can be>radon 210.



option E tech 99>pro..234.
radon 210>tech99>pro234.

option D is correct.

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Re: Radon-210 is more radioactive than Technetium-99. Since Promethium-61  [#permalink]

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New post 22 Feb 2016, 19:45
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Harley1980 wrote:
Radon-210 is more radioactive than Technetium-99. Since Promethium-61 is more radioactive than Protactinium-234, it follows that Radon-210 is more radioactive than Protactinium-234.

Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:

A) Technetium-99 is more radioactive than Promethium-61.
B) Promethium-61 and Technetium-99 have equal levels of radioactivity.
C) Promethium-61 and Radon-210 have equal levels of radioactivity.
D) Promethium-61 is more radioactive than Radon-210.
E) Technetium-99 is more radioactive than Protactinium-234.


210>99
61>234
conclusion: 210>234
it will be the case only when:
1. 210=61
2. 210>61
3. 99=61
4. 99>61
5. 99>234
6. 99=234

A - 99>61 - case 4
B - 61=99 - case 3
C - 61=210 - case 1
D - 61>210 - hm..hold.
E - 99>234 -> case 5.

as we see, only D fits.
D tells that 61>210, but it might be 61 - 234 - 210. since we dont know the relationship of 234 and 210 here, we can't give a definite answer.
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Re: Radon-210 is more radioactive than Technetium-99. Since Promethium-61  [#permalink]

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New post 13 Aug 2018, 16:22

Official Explanation


OK, for simplicity, I will say R = (Radon-210), T = (Technetium-99), PM = (Promethium-61) and PN = (Protactinium-234).

The argument has the premises

(i) R > T

(ii) PM > PN

and it wants to conclude R > PN.

This is an EXCEPT question. Four of the five responses will, when added to premises (i) & (ii), make the entire argument valid: these four will be incorrect. One of the answers will either contradict the conclusion or leave open uncertainty, and this oddball answer will be the correct answer to this question.

The credited answer is (D), which says PM > R. This means both R & PN are less than PM, but we are left with uncertainty about how R and PN compare to one another. Choice (D) leaves us with uncertainty, so it is correct answer to the EXCEPT question.

Choice (A) says T > PM. That means R > T > PM > PN, which directly implies that R > PN. Choice (A) turns this into a valid argument supporting the conclusion, so it is incorrect.

Choice (B) says T = PM. That means R > T = PM > PN, which directly implies that R > PN. Choice (B) turns this into a valid argument supporting the conclusion, so it is incorrect.

Choice (C) says PM = R. That means R = PM > PN, which directly implies that R > PN. Choice (C) turns this into a valid argument supporting the conclusion, so it is incorrect.

Choice (E) says T > PN. That means R > T > PN, which directly implies that R > PN. Choice (E) turns this into a valid argument supporting the conclusion, so it is incorrect.
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Re: Radon-210 is more radioactive than Technetium-99. Since Promethium-61 &nbs [#permalink] 13 Aug 2018, 16:22
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Radon-210 is more radioactive than Technetium-99. Since Promethium-61

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