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By Margarette Jung on October 18, 2011 in Algebra, Exponents, Integer Properties, Math Concepts, Math Question Types, Numeric Entry, Practice Question of the Week

Here are the answer and explanation to yesterday’s practice question. Thanks for submitting your answers!

Video Explanation:

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Hello,

For the above question I wanted to ask if it’s okay to bring the negative exponents to the denominator in the first step, ie:

[1/(3)(2^n)] x [1/(2)(3^n)]

Then in the denominator, for the numbers w/o the exponent since 3×2 = 6, we need 6 x # = 36. So n has to equal 1.

Is that correct?

Hi Arpita,

That is definitely correct. In fact, doing it that way is far faster (it’s also the way I’d do it :)).

At the same time, when we offer up an explanation, sometimes the algebraic method is a safe way of solving problems, because it shows each steps clearly.

Anyhow, keep using your method, because it shows you are picking up on the patterns, and that is exactly what the GRE is looking for!