div A == 4650

4650 customers service error 86
100 customers service error ( 86/4650) *100

B = Y
Berror = x

Total error 86+x/4650+y = 1.5

From 2

Y = 9350

Hence C

Please do not show the answer.

Can you please provide source of this q?

aba=a

let a != 0

then ab= 1

but if a=0

then ab =0

same for stmt 2

combine and put non zero/zero value same discrepancy will come.
So, E

It has been discussed before.

in B commonntrait is to ignore total sample space

which can be selecting two women (or) selecting one woman and one man (or) selecting two men

As selecting one woman and one man can not be determined , hence E

Great job bro. u inspire a whole lotta people.

Could you please share what lessons did you learn after first time failure?

what kind of vaccum? Bissel or Dirtmagic?

Vidyarthi, the only thing that is wrong with you is that "nothing is wrong with you". GMAT , like most of the adaptive tests, depends a li'l bit on your exam day luck and lot on exam day concentration. Start concentarting one q at a time and forget about everything else. There is no magic ...

imo it is A.

what is OA

easiest way to do is put vallues

you will find out that if n is even all terms cancel out each other

onlyt the last term survives which would be positive.

Similarly if n-th term is positive it can happen only if n is odd and it will be sum too.
I tried with n=3, n=4, n=5 etc.
Answer D.