“application: not a procedure” while computing binomial

Question

I am defining a function binomial(n k) (aka Pascal\'s triangle) but am getting an error:

    application: not a procedure;
    expected a procedure          


        

Answer 1

This is the correct code:

 (define (binomial n k)
          (cond  ((or (= n 0) (= n k)) 1)
              (else (+ (binomial n (- k 1))(binomial(- n 1) (- k 1)))))) 

Problem is at here:

(binomial (n) (- k 1))