# GRE practice test question that I need help figuring out...?

I took a practice test and am trying to figure out why I missed the ones I missed.

Here's the question:

The expression mRn, where m and n are positive integers, denotes that m=n^2^-1. If rRs and sRp, then in terms of p, r equals:

a. p^4^

b. p^4^-4

c. (p^2^-1)^2^-1

The right answer is C; my problem is just that I'm not understanding how the problem iw solved to begin with, if that makes sense.

### 2 Answers

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- Some BodyLv 71 decade agoFavorite Answer
mRn: m = n^2^-1

rRs: r = s^2^-1

sRp: s = p^2^-1

r = (p^2^-1)^2^-1

C

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- Anonymous1 decade ago
r = s^2 - 1

s = p^2 -1

substitue s in eqation 1

r = (p^2 -1)^2 -1

hope it helps

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