4^17=(2^2)^17=2^34
2^34-2^28=2^28(2^6-1)=2^28*63=2^28*7*3*3
the only prime factors i see are 2,3,7
7 is the largest
my answer D
GMAT prep 2 #2
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Source: Beat The GMAT — Data Sufficiency |
