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14 Feb 2012, 05:37
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
66% (00:53) correct
34%
(01:05)
wrong
based on 116
sessions
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14 Feb 2012, 05:51
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If w + k = v, what is the value of k
(1) v^3 = w^3 --> v=w --> w+k=w --> k=0. Sufficient.
(2) v^2 = w^2 --> |v|=|w| --> if v=w then k=0 (see above) but if v=-w then k=-2w, and k can take multiple values depending on w. Not sufficient.
Answer: A.
(1) v^3 = w^3 --> v=w --> w+k=w --> k=0. Sufficient.
(2) v^2 = w^2 --> |v|=|w| --> if v=w then k=0 (see above) but if v=-w then k=-2w, and k can take multiple values depending on w. Not sufficient.
Answer: A.
14 Feb 2012, 23:16
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Hi could you please elaborate the solution to pt. 1?
I did this :
v^3-w^3=0 --> (v-w)(v^2+w^2+wv)=0--> k(k^2+3vw)=0 ---> therefore k can be 0 or -3vw.. am not sure how A is sufficient
I did this :
v^3-w^3=0 --> (v-w)(v^2+w^2+wv)=0--> k(k^2+3vw)=0 ---> therefore k can be 0 or -3vw.. am not sure how A is sufficient
Bunuel
If w + k = v, what is the value of k
(1) v^3 = w^3 --> v=w --> w+k=w --> k=0. Sufficient.
(2) v^2 = w^2 --> |v|=|w| --> if v=w then k=0 (see above) but if v=-w then k=-2w, and k can take multiple values depending on w. Not sufficient.
Answer: A.
(1) v^3 = w^3 --> v=w --> w+k=w --> k=0. Sufficient.
(2) v^2 = w^2 --> |v|=|w| --> if v=w then k=0 (see above) but if v=-w then k=-2w, and k can take multiple values depending on w. Not sufficient.
Answer: A.
