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Difficulty:
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52% (01:47) correct
48%
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21 Sep 2017, 05:39
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We need to locate one of the following scenarios:
x<0 or x>10^1/9
(1) x>0
If x lies between 0 and 10^1/9 then NO
If x > 10^1/9 then YES
(2) x lies in interval (-1;1)
Insufficient as long as different cases are possible, see example from (1)
combining (1)+(2) we have that x lies between (0;1), again example from (1) shows that it's not sufficient.
Answer E.
P.S. I'm not sure whether my line of reasoning is correct
x<0 or x>10^1/9
(1) x>0
If x lies between 0 and 10^1/9 then NO
If x > 10^1/9 then YES
(2) x lies in interval (-1;1)
Insufficient as long as different cases are possible, see example from (1)
combining (1)+(2) we have that x lies between (0;1), again example from (1) shows that it's not sufficient.
Answer E.
P.S. I'm not sure whether my line of reasoning is correct
(1) х > 0
if х = 10^(1/9) (approx.1.29) than 10х = х^10 and NO
if 0 < х < 10^(1/9) than YES
If х > 10^(1/9) and x <0 than NO
Unsufficient
(2) -1 < х < 1
Unsufficient, see (1)
(1) + (2) sufficient, see (1)
Answer D
Sorry, if (1) + (2) sufficient than Answer C, not D (thx Alexey1989x)
if х = 10^(1/9) (approx.1.29) than 10х = х^10 and NO
if 0 < х < 10^(1/9) than YES
If х > 10^(1/9) and x <0 than NO
Unsufficient
(2) -1 < х < 1
Unsufficient, see (1)
(1) + (2) sufficient, see (1)
Answer D
Sorry, if (1) + (2) sufficient than Answer C, not D (thx Alexey1989x)
