Unfortunately, I haven’t been able to figure out how to find the volume of a unit n-simplex without calculus or linear algebra. Any suggestions? Simple single-

Unfortunately, I haven’t been able to figure out how to find the volume of a unit n-simplex without calculus or linear algebra. Any suggestions? Simple single-variable calculus would be acceptable, like finding the area under the curve y = 1 – √x when x ranges from 0 to 1, but I’d prefer to avoid nested integrals and trigonometric integrals and derivatives.