GMAT Algebra - How to go from 50th to 90th percentile?

[@jesherpalomaria7996]

This session showed a whole host of questions that were seemingly basic but were actually filled with pitfalls that lead someone to the wrong answer. Thank you so much for these discussions!

[@gmatclub]

Thank you for your feedback and glad to hear this one was helpful 👍 If you have a chance please like and subscribe, we would really appreciate it.

[@sanskritibisht5033]

4:07 / 1:29:06 missed the inference of 2nd option. n+1=n+1 means n can have any value=> NS. Ques stem specifically ASK FOR "n". so uniqule value is needed.

[@vishalnarkhede1511]

1:00:33 here x^2+1 = 0 x can be i, if we consider the same expression as x^2 = -1

[@filippoiguera3224]

47:05 here if we just subtract the inequalities we have our answer in 30 sec

[@maggieznoodles]

how to watch videos of old webinars from e-gmat? Please help

[@vipinchaurasia1]

Can anyone help me with the difficulty level of question (Category to which these questions pertain)? Thanks

[@filippoiguera3224]

Post it on GMAT club, they can help you there!

[@ankurchakrabarti7347]

I think the solution to question 5 is wrong and here’s why. For statement 1: |a-b| = b-a Implies a-b = +-(b-a) which over solving gives us 2 equations: 1. a=a; which doesn’t tell us anything and holds true for anything and 2. 2a=2b => a=b . Sufficient to say a is not less than b. The core concept: |x-a|=y signifies that x is within a units of +- y on the number line. Here the variable “x” is a-b and “y” is b-a Hence “a” should be sufficient on its own as we have established one equation to prove the relationship. Let me know if I am wrong anywhere. As per me, the flaw in the video is considering b-a as either positive or negative and not positive or negative a-b.

[@feebs8835]

I think question 5 is wrong. It should be (E). Not seeing how it can be (C). Scenario 1: a and b could both be 0, thus a is not less than b 1) |0-0| = 0 - 0 2) 0/0 < 1 Scenario 2: a could also be less than b (say, a=-3 and b=5) 1) |(-3 ) - (5)| = 5 - (-3) or |-8| = 8 2) -3/5 < 1 These two different scenarios can't prove that a is or isn't less than b. Can anyone tell me where I went wrong?

[@srilanka739]

in the gmat you dont divide by 0 so a/b cannot be 0/0