The digits 1,2,3,4 and 9 are each once .数学英语题The digits 1,2,3,4 and 9 are each once to form the greatest possible even five-digit number.What's the digit in the tens place?
问题描述：
The digits 1,2,3,4 and 9 are each once .数学英语题
The digits 1,2,3,4 and 9 are each once to form the greatest possible even five-digit number.What's the digit in the tens place?
答