3-10
for all X,X is positive interger, "2-height" is defined to be the greatest nonnegative n of x, what is the greatest number of 2-height when 2" is the factor of x?
A.2
B.12
C.40
D.76
E.90
這一題我很遜的連題目都看不懂!!...>< 唉呀..糟
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