GRE数学which of the following cannot be a factor of 2^i*3^j where i and j are positive intergers?
问题描述：
GRE数学which of the following cannot be a factor of 2^i*3^j where i and j are positive intergers?
which of the following cannot be a factor of 2^i*3^j where i and j are positive intergers?
A.6
B.8
C.27
D.42
E.54
为什么是C,j是3的时候,27不就是一个因子么?
答
A 6= 2*3
B 8=2^3
C 27=3^3
D 42=2*3*7 有质因子7 ,答案是d
E 54=2*3^3