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06 Dec 2016, 07:29
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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:
45%
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60% (01:24) correct
40%
(01:19)
wrong
based on 187
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If b > 1, is integer b less than 11?
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
07 Dec 2016, 09:07
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Bunuel
If b > 1, is integer b less than 11?
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
since integer b>1 and al its factors are in the range 2<=f<=9 , i.e all factors of b that are >1 are larger than 9 ( could be 11,13,17etc) , thus B could be 11 13 or 17 or ....etc..suff
from 2
b has exactly 2 factors and since one of them is 1 then the other is itself , i.e. it is prime but there are primes that are larger than 11 and those that are less... insuff
A
10 Dec 2016, 08:58
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yezz
Bunuel
If b > 1, is integer b less than 11?
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
(1) b has no integer factors, f, such that 1 < f < 10.
(2) b has exactly two factors.
since integer b>1 and al its factors are in the range 2<=f<=9 , i.e all factors of b that are >1 are larger than 9 ( could be 10 or 11...etc) ,thus B could be 10 or 11 or ....etc..insuff
from 2
b has exactly 2 factors and since one of them is 1 then the other is itself , i.e. it is prime but there are primes that are larger than 11 and those that are less... insuff
both
b is a prime larger than 9 thus the least it can be is 11 .... suff
IMHO answer is A.
If b is an integer with NO factors f such as 1<f<10 then b is a prime number >= 11. If b was 10, then it would have 5 and 2 among its factors
