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gmatinjune
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#1. Not sufficient. try with y=1;n=4 and y=2;n=10
#2. Sufficient. (x/y)>5. n>x>=5...
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Agree 'B' is sufficient, same reasoning with humans.
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gmatinjune
If x,y,n are +ve integers, is (x/y)^n> 1000 ?

1. x=y^3, n >y
2. x > 5y, n >x.

I dont know OA



Using AD-BCE elimination,

let's take 'A', using x = y = 1 and n =2 - we can't say. INSUFF.

So that leaves us with BCE

let's take B with lowest integers
y = 1, x = 5 and n = 6 which gives us
5^6 which is > 1000. SUFF.

(B)



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