It's quite a few years since I did anything with Lisp myself so I do not know whether the + and * was made to accept a variable number of parameters or just two. Suppose you defined a function yourself and it expected two parameters, what would the result of (foo 1 2 3) be then? The same as (foo 1 2) or ((foo 1 2) 3) or even (foo (foo 1 2) 3) or (foo 1 (foo 2 3))?

It depends. I suspect, and this is without study, that Lisp functions are naturally greedy and that the fact you only used two parameters is your problem, not Lisp's. I do remember in Paul Graham's book on Lisp (the few chapters I did read) that the mathematical operators are greedy, so the answer would be 222.

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