PP-T2-DS184

[Huang Hsin-Yi]

184. 17933-!-item-!-187;#058&011666
If k is an integer greater than 1, is k equal to 2^r for some positive integer r ?

(1) k is divisible by 2^6.

(2) k is not divisible by any odd integer greater than 1.

Ans:B

不清楚題目問什麼

[Huang Hsin-Yi]

看了前人的討論後得知
題目問 k=2^r?

(1) K=2^6*x
when x=3 the answer is no
when x=8 the answer is yes........................insufficient

(2) 得知k無大於1奇數的因子
因此k=1*2*2*2*2......=2^r...........................sufficient