Special test mathematics 4
A. Traditional questions
Let the answer be \ (\ sum \ limits {I = 1} ^ NIF (I) \)
\(F(i) \) is the number of schemes with the answer \ (i \)
If you can't find it directly, it can be simply transformed into \ (\ sum \ limits {I = 1} ^ n (m ^ n-f (ANS < I)) \)
Then consider finding \ (\ sum \ limits {I = 1} ^ NF (ANS < I) \ rightarrow \ sum ...
Added by techtheatre on Sun, 09 Jan 2022 02:06:51 +0200