Factorial Division

function solve(n,n1){

  let solution = factorial(n) / factorial(n1);

  console.log(solution.toFixed(2))

  function factorial(num){
    if(num < 0){
      return -1;
    }
    else if(num === 0){
      return 1;
    }else{
      return (num * factorial(num -1));
    }
  }

}
solve(5,2);