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Difficulty:
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30% (02:16) correct
70%
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wrong
based on 102
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Is k < 0?
(1) |2k + 5| = 3k + 1
(2) |k - 2| = 7k
(1) |2k + 5| = 3k + 1
(2) |k - 2| = 7k
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16 Apr 2019, 20:23
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Is k < 0?
(1) |2k + 5| = 3k + 1
Two cases..
2k+5=3k+1......k=4
-2k-5=3k+1......5k=-6 or k=-1.2
But substitute these values back in equation to check whether 3k+1\(\geq{0}\)..
3*4+1\(\geq{0}\)...Yes
3*(-1.2)+1\(\geq{0}\)..No
So k is 4, and sufficient
(2) |k - 2| = 7k
7k\(\geq{0}\), so k is not less than 0.
Sufficient
D..
The OA B is wrong, and the question has different possible values of k in each condition, which is never the case in official questions.
(1) |2k + 5| = 3k + 1
Two cases..
2k+5=3k+1......k=4
-2k-5=3k+1......5k=-6 or k=-1.2
But substitute these values back in equation to check whether 3k+1\(\geq{0}\)..
3*4+1\(\geq{0}\)...Yes
3*(-1.2)+1\(\geq{0}\)..No
So k is 4, and sufficient
(2) |k - 2| = 7k
7k\(\geq{0}\), so k is not less than 0.
Sufficient
D..
The OA B is wrong, and the question has different possible values of k in each condition, which is never the case in official questions.
01 May 2019, 06:47
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Why are we substituting the values and checking if 3k+1>=0?
Why have we considered >=0 to cross-check?
Why have we considered >=0 to cross-check?
