For all x, x is positive integer, "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 Answer: (by Anchoret) A. 2=2^1 B. 12=2^2*3 C. 40=2^3*5 D. 76=19*2^2 E. 90=45*2^1 B is the answer.
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发表于 2011-3-17 19:04:59
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