4^17 = (2^2)^17 = 2^34.
This means that 2^34 - 2^28 = 2^28 (2^6 - 1) = 2^28 * 63 = 2^28 * 3^2 * 7.
Greatest prime factor is 7.
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Greatest Prime Factor
Source: Beat The GMAT — Problem Solving |
2^34-2^28
=2^28*(2^6-1)
=2^28*63
=2^28*3^3*7
Answer =7
(D)
=2^28*(2^6-1)
=2^28*63
=2^28*3^3*7
Answer =7
(D)
Drill baby drill !
GMATPowerPrep Test1= 740
GMATPowerPrep Test2= 760
Kaplan Diagnostic Test= 700
Kaplan Test1=600
Kalplan Test2=670
Kalplan Test3=570
GMATPowerPrep Test1= 740
GMATPowerPrep Test2= 760
Kaplan Diagnostic Test= 700
Kaplan Test1=600
Kalplan Test2=670
Kalplan Test3=570
