Hi guys--two more I couldn't figure out.
144.
If n is a positive integer, is (1/10)^n <less> 2
(2) (1/10)^n-1 <0.1
The answer is D.
But I do not understand how part 2 in itself is sufficient. N could be 0 or 1, in which case the term would not be < 0.1. But if it was 3 or greater, then it would be <0.1. So that makes part 2 insufficient, doesn't it?
The other one is # 146, also in data sufficiency (page337). Here's the question:
Is n an integer?
(1) n^2 is an integer.
(2) the square root of n is an integer.
The answer, according to the explanation, is B. But why isn't A sufficient? if n squared is an integer, then doesn't n have to be an integer? True, it could be negative or positive, but no decimal/fractional value will work for n, therefore it has to be an integer. SO why isn't A alone sufficient, as well as B?
I am wondering if these are errors in the book, or if I am an idiot. Please help!
144.
If n is a positive integer, is (1/10)^n <less> 2
(2) (1/10)^n-1 <0.1
The answer is D.
But I do not understand how part 2 in itself is sufficient. N could be 0 or 1, in which case the term would not be < 0.1. But if it was 3 or greater, then it would be <0.1. So that makes part 2 insufficient, doesn't it?
The other one is # 146, also in data sufficiency (page337). Here's the question:
Is n an integer?
(1) n^2 is an integer.
(2) the square root of n is an integer.
The answer, according to the explanation, is B. But why isn't A sufficient? if n squared is an integer, then doesn't n have to be an integer? True, it could be negative or positive, but no decimal/fractional value will work for n, therefore it has to be an integer. SO why isn't A alone sufficient, as well as B?
I am wondering if these are errors in the book, or if I am an idiot. Please help!
