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Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
25 Oct 2016, 23:03
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A
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Difficulty:
55%
(hard)
Question Stats:
53% (01:23) correct
47%
(01:49)
wrong
based on 144
sessions
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25 Oct 2016, 23:40
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Bunuel
What is the value a^3 - b^3?
(1) a^2 + ab + b^2 = 0
(2) a - b = 3b
(1) a^2 + ab + b^2 = 0
(2) a - b = 3b
(1) a^2 + ab + b^2 = 0
or (a+b)^2-ab=0
(a+b)^2=ab
thus ab is >=0
Now as sum of all +ve number a^2 + ab + b^2 =0 then a &b are 0
thus a^3 - b^3=0.........suff
(2)a=4b
a & b could be any number ....not suff..
Ans A
28 Oct 2016, 02:30
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Bunuel
What is the value a^3 - b^3?
(1) a^2 + ab + b^2 = 0
(2) a - b = 3b
(1) a^2 + ab + b^2 = 0
(2) a - b = 3b
a^3-b^3 = (a-b)(a^2 + ab + b^2 )
from 1
suff
from 2
a = 4b
(3b) (16b^2+4b^2+b^2)... no idea about b ... insuff
A
