GWD-3-2

bipedalisms

What is the greatest prime factor of 2¹⁰⁰ - 2⁹⁶?

A. 2

B. 3

C. 5

D. 7

E. 11

answer is C, but I think should be D.

2^100-2^96=2^96(2^4-1)=2^96*7. right?

michellemove

2^4=16

2^4-1=15=5*3

要仔细啊，这种马虎要不得