Hey, I just passed the GMAT!! 
) CELEBRATION!!!! 
However..........
There was this ONE PROBLEM that keeps eating at me!
It says let x = -1. Then it gives a formula and that formula is x to the power of n plus x to the power of (n-1) plus x to the power of (n-2). So, x^n + x^(n-1) + x^(n-2). Then it says that n is the sum of all the prime numbers up to 403. WTF?????????
How am I supposed to know that?? Not fair.
I can see that if n was odd, then the answer would be -1 and if n was even, the answer would be 1. But how do they expect me to know the sum of all the prime numbers up to 403?
If there were an even number of prime numbers, and all are odd except 2, then we would have odd + odd + even = even. If there were an odd number of prime numbers, then we would have odd + odd + odd + even = odd.
????????????????????????
) CELEBRATION!!!! However..........
There was this ONE PROBLEM that keeps eating at me!
It says let x = -1. Then it gives a formula and that formula is x to the power of n plus x to the power of (n-1) plus x to the power of (n-2). So, x^n + x^(n-1) + x^(n-2). Then it says that n is the sum of all the prime numbers up to 403. WTF?????????
How am I supposed to know that?? Not fair.
I can see that if n was odd, then the answer would be -1 and if n was even, the answer would be 1. But how do they expect me to know the sum of all the prime numbers up to 403?
If there were an even number of prime numbers, and all are odd except 2, then we would have odd + odd + even = even. If there were an odd number of prime numbers, then we would have odd + odd + odd + even = odd.
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