F# is the kind of language that can really energize someone who is excited about just sitting down and powering out a solution.

Here is an example of how to sum some fibonacci numbers.

let rec fibonacci n =

if n < 2 then 1

else fibonacci (n-2) + fibonacci(n-1)

//create a recursive function called fibonacci

//that takes the parameter n

// if n < 2 then 1 so this is the base case.

//else fib (n – 2) + fib (n – 1)

printfn "fibonacci = %A" (fibonacci 10)

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