第一大题的第五小题怎么做
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yn=m(m-1)...(m-n+1)/n!
y1 = m/1! = m
y2 = m(m-1)/2! = m(m-1)/2
y3 = m(m-1)(m-2)/3! = m(m-1)(m-2)/6
y4 = m(m-1)(m-2)(m-3)/4! = m(m-1)(m-2)(m-3)/24
y5 = m(m-1)(m-2)(m-3)(m-4)/5! = m(m-1)(m-2)(m-3)(m-4)/120
y1 = m/1! = m
y2 = m(m-1)/2! = m(m-1)/2
y3 = m(m-1)(m-2)/3! = m(m-1)(m-2)/6
y4 = m(m-1)(m-2)(m-3)/4! = m(m-1)(m-2)(m-3)/24
y5 = m(m-1)(m-2)(m-3)(m-4)/5! = m(m-1)(m-2)(m-3)(m-4)/120
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