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Please answer this:3+4 =

Original Message (ID '198372') By jf:
In[2]:= y[0] = 4; y[n_Integer?Positive] := y[n - 1] + 1; In[4]:= y[4] Out[4]= 8 You could probably get away with y[n_] := y[n - 1] + 1; for the recursive definition, but the extra will prevent an infinite recursion in case an invalid argument is given.