exponent mystery

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nafiul9090: Master | Next Rank: 500 Posts; Posts: 226; Joined: Thu Nov 25, 2010 12:19 am; Thanked: 3 times; Followed by:2 members

by nafiul9090 » Tue Mar 13, 2012 4:59 pm

if x is not equals to 0, what is the value of (x^m/x^n)^5

i) n-m=2
ii) x^2= 1/4

oa comes later

Source: Beat The GMAT — Data Sufficiency | Tue Mar 13, 2012 4:59 pm

killer1387: Legendary Member; Posts: 581; Joined: Sun Apr 03, 2011 7:53 am; Thanked: 52 times; Followed by:5 members

by killer1387 » Tue Mar 13, 2012 6:47 pm

nafiul9090 wrote:if x is not equals to 0, what is the value of (x^m/x^n)^5

i) n-m=2
ii) x^2= 1/4

oa comes later

(x^m/x^n)^5

1) (x^(m-n))^5=(x^(-2))^5
Insufficient

2) insufficient

1& 2
sufficient

hence C

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