Yeah guys, OA is (E). I am still trying to convince myself on (E) b/c i do not have an OE.
i'll look at qpoo's post now.
I am pretty sure you accept why COndition 2 is insufficient
As far as condition 1 is concerned i went like this
n^3 - n^3x^2 <0
subtract n^3 on both sides
- n^3x^2 < -n^3
multiply -1 to both sides (sign in ineq changes)
n^3x^2 > n^3
Divide both sides ny n^3 which could be + or -
If it is positive then we get x^2 > 1 (or x > +/-1) so we cannot say
if it is negative then we get x^2 < 1 (or x < +/- 1) so again we cannot say
COmbining both conditions is useless because condition 1 is a subset of condition 2. Hence E
Fear Mediocrity, Respect Ignorance