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The ques is asking Is .n68<1/n and not for what value of n.
It should be E. Please correct me if i am wrong.
I go with B. The statement only works with B and the question is asking if we have enough information to answer the question. Since with B we know that n=1 we plug that back into the question and find that 0.168 is indeed less than 1 and sufficient to answer the question. Hope this helps.
if n=0 the expression goes to infinity which is indeterminate.
For this question we should infer that n is a number from 1 to 9. The fact that 1/n is included in the stem has precluded the possibility of n=0. For GMAT remember if something appears in the denominator, it is non zero. However, if you see something like n*0.n68<1, you cannot devide both sides by n while assuming n is non-zero.
Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.
In fact, in the decimal represtentation of a number, n is a positive integer from 0 to 9.
If the second statement is true, n=1. For n=0 the expression is nonsense, because you cannot divide by 0.
Note that in evaluating the sufficiency of the first statement you have to consider the case n=0, because n<5 does not exclude this possibility. Whereas, in evaluating the sufficiency of the second statement, you haven't to consider n=0, because for n=0 the hypothesis you should assume to be true would not be verified.