Thanks Ashu it clarified the doubt.

Agree with Chetan tough call between C and D... C is in line with argument thinking...i.e. it tends to strngthen the argument so answer should be C D is tough one ...but on second thoughts...D says that low cost airline only use 10% of slots in busy airports ad such there is not much chance of impro...

I also would go for C...

Moreover in C the usage of Past perfect tense looks wierd...

learning here is that in any even set of consecutive numbers no. of even and odd numbers are same.

and in a set of odd numbers ...the count of even and odd numbers will vary.

Though not a proof ...but I read some where to think of clock while doing this question. When the 2 hands of clock are at 90 degrees then the area formed by these hands will be max...

when we increase/decrease this angle the area decreases.
this is just a concept but it explains this.

Hi Eagleeye, understood your explanation...have a doubt on what is real number... can you please explain what are real numbers. would all integers be considered real number. Hopefully this answers your doubts. Concept: sqrt (a^2) = |a| ; this is always true for any real a. Now: we have to find x. Le...

avg = sum/no. of term so avg = s/n from 2 since s<n so s/n is not 1 SUFF from 1 try numbers -2,-1 avg = -3/2 1,2,3,4 avg 10/4 so avg is not 1 SUFF D should be ans Is the average of n consecutive integers equal to 1? (1) n is even. (2) If S is the sum of the n consecutive integers, then 0 <s <n.