Recently, I have been practicing GRE math from Manhattan Gre guide(8 series one). An excellent book to practice and overcome those pitfalls that occur usually in the real exam. Some of these strategies might help you.
From Math Algebra Manhattan GRE guide:
1.a<b<c
ac versus bc<quant comparision)
Well,the pitfall we multiply c to get ac<bc<c^2 and mark the answer as b, well check for values say -5,-4,-3(a,b,c) you'd choose 'd' as the right option
Answer is d(The relationship cant be determined...)
2.x<0
|x| versus -x<quant comparision>
The important point to remember ever is absolute value of quantity is quantity itself
Therefore the answer is c<both quantities equal>
* 10 is Increased by a factor of 2=>10*2=>20 % increaase =(20-10)/10*100=100%
3.Graph of y=2|x-4|+1
*The cut of absolute value function will be located at the value of x for which the absolute values reaches the minimum possible value when x=4 y=1;when x=0 y=9
d versus 0<quant comp>
solving we get d^2=4=> d=+/- 2
but the original eqn has d-2 in denominator and therefore substituting d=2 will land us with infinity. Hence d=-2 is the answer and -2<0 hence option b is correct<quant b is greater>
* Sum to n terms for gp(t2/t1=t3/t2) = sn=a[1-r^n]/[1-r]
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