What is the greatest prime factor of 4^17 - 2^28?
1) 2
2) 3
3) 5
4) 7
5) 11
This doesn't seem that difficult, but after I reduce it to 4^17 - 4^14 or 2^34 - 2^28, I don't see what else I can do. I'm sure I'm missing something quite easy.
GMAT Prep
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In fact according to D it's either X=1 or Y=0....
Now if we put only Y=0..equation comes to Z=XZ....
this can't be true since X can hold any value....it means D can't be answer at any cost....
Now if we put only Y=0..equation comes to Z=XZ....
this can't be true since X can hold any value....it means D can't be answer at any cost....
Thanks,
UmanG - restless mind..
UmanG - restless mind..