n!/1个1,n!/2个2,。。。,n!/n个n 这些数能否分成n!组,使每组的和是n 证明或反证 This problem was first posted at WXC by 乱弹 several months ago. It was ignored then and later caused some problems, as stated by himself recently, about "谁是中文网第一数学论坛". It reappeared there three days ago, but still no answer as of now.
www.ddhw.com
|