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Parameter conditions


I'm just curious why the simple code below is not working.

Why is happy[4] not returning the number 200


In[1]:=  happy[p_?PrimeQ] = 100;
           happy[p_?Not[PrimeQ]] = 200;

In[3]:=  Inhappy[4]
Out[3]:= happy[4]

In[4]:=  happy[5]
Out[4]:=  100


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