F# on Algorithms - Find Triangle

find possible of elements in an array which can form a triangle.

let getTriangle (l:_ list) =
    let len = l.Length
    [
        for i=0 to len-1 do
            for j = i+1 to len-1 do
                for k=j+1 to len-1 do
                    if l.[i] + l.[j] > l.[k] &&
                       l.[j] + l.[k] > l.[i] &&
                       l.[k] + l.[i] > l.[j] then yield l.[i], l.[j], l.[k] ]

getTriangle [10; 21; 22; 100; 101; 200; 300]