This is actually the basis for calculating probabilities in a binomial distribution, which might track the total number of heads in a series of coin flips.If you only care about the total, then order does not matter, and so H-H-T is an equivalent outcome to H-T-H. ...
C(n,0)=C(n,n)=1 上述公式和帕斯卡三角形的工作:让我们看看上述公式如何适用于 C(4, 3)1===>> n = 0, C(0, 0) = 1 1-1===>> n = 1, C(1, 0) = 1, C(1, 1) = 1 1-2-1===>> n = 2 , C(2, 0) = 1, C(2, 1) = 2, C(2, 2) = 1 1–3–3–1===>...