Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
{1,2,3,4,5} 组成 3 位不同数字数？（答： 60 。）
{1,2,3,4,5} 组成 3 位不同数字数？（答： 60 。）
Natural Language
Math Input
Extended Keyboard
