Yan Cui
I help clients go faster for less using serverless technologies.
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Problem
There are exactly ten ways of selecting three from five, 12345:
123, 124, 125, 134, 135, 145, 234, 235, 245, and 345
In combinatorics, we use the notation, 5C3 = 10.
In general,
It is not until n = 23, that a value exceeds one-million: 23C10 = 1144066.
How many, not necessarily distinct, values of nCr, for 1 <= n <= 100, are greater than one-million?
Solution
1 2 3 4 5 6 7 8 9 | let factorial n = if (n = 0I) then 1I else [1I..n] |> List.reduce (*)let C n r = if r <= n then (factorial n) / ((factorial r) * (factorial (n - r))) else 0Ilet answer = [1I..100I] |> List.collect (fun n -> [1I..n] |> List.map (fun r -> C n r)) |> List.filter (fun x -> x > 1000000I) |> List.length |
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