标题: difference between nPr and nCr and when to use which [打印本页] 作者: andytrader 时间: 2013-3-31 17:39 标题: difference between nPr and nCr and when to use which
Difference between nPr and nCr and when to use which作者: liquidity 时间: 2013-3-31 17:39
You use nPr for permutations when order matters (i.e. when order is ranked)
You use nCr for combinations when order does not matter
