Hi All,

The wording of this prompt provides a HUGE hint as to how you can solve it quickly. While the individual calculation in the prompt might "look" scary, you can actually ignore most of it. Here's why: the prompt asks for the FIRST value that will lead to a result that is greater than 500. Since the answers are NUMBERS, we know that one of the MUST be the first value that fits this description.

We can TEST THE ANSWERS and use the "spread" (and a bit of estimation) to get to the solution.

First, a quick look at Answer A (since 13^2 isn't a terrible calculation)

IF...N = 13

13^2 + 13 = 169 + 13 + a little more = 182 + a little more. This is NOT greater than 500

Next, Answer B....N =22

For the sake of estimation, let's use N = 20

20^2 + 20 = 400 + 20 + a little more at the end + whatever else isn't there because I rounded down from 22 to 20....

This might be greater than 500, but I'm not going to spend time trying to prove it just yet.....

Finally, Answer C...N = 33

For estimation purposes, let's use N = 30

30^2 = 900, which is WAY TOO BIG, so N = 33 would be even BIGGER. This can't be the answer.

The remaining answers would be even bigger than C, so they're both out. The only answer that makes any sense is B.

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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# Rich Cohen

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