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--- Well spotted. The 'n' in the Arithmetic Progression equation should be replaced with (n-1)/2. Because when you have every other number in a continous series, the total no of even numbers is (n-1)/2 when the nth term is odd.

Is this where we can discuss the solutions to the problems? I'm looking at problem two and don't quite understand a couple of things.

1) Do we have to add the two equations: x+y+z=50 & 6x-2y-z=192 or can we subtract them? Why or why not? 2) Where does the assumption that y can't be 1 or 2 come from. Please explain.

Thanks in advance

Liz _________________

The Brain Dump - From Low GPA to Top MBA(Updated September 1, 2013) - A Few of My Favorite Things--> http://cheetarah1980.blogspot.com

How are you supposed to actually learn how to solve these questions? I could spend an hour trying to solve some of the questions and even that I will probably still be stumped....is there a good way to learn the tricks to solve these toughies?

gmatclubot

Re: 50 tricky questions
[#permalink]
02 Aug 2011, 14:03

So, my final tally is in. I applied to three b schools in total this season: INSEAD – admitted MIT Sloan – admitted Wharton – waitlisted and dinged No...

HBS alum talks about effective altruism and founding and ultimately closing MBAs Across America at TED: Casey Gerald speaks at TED2016 – Dream, February 15-19, 2016, Vancouver Convention Center...