确认这道题的答案到底是？

1)

3^m*(1/2)^n

=3^m*(1/2)^2m

=3^m*(1/4)^m

=(3/4)^m<1

sufficient

2)n=2, m could be any positive integer such as 1,2,3,4,5,6, etc

so, when m=1, the expression>1

when m>1, the expression<1

not sufficient

key=A

他写倒了，应该是 3^m/4, 当m>1 结果>1, 当 m=1, 结果<1, 但结论不变 A。