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Please answer this:1+2 =

Original Message (ID '73252') By Bill Simpson:
In[1]:= expr=3*x Out[1]= 3 x In[2]:= f[x_]=expr Out[2]= 3 x In[3]:= f[2] Out[3]= 6 In[4]:= f[Pi] Out[4]= 3 Pi In[5]:= f[a] Out[5]= 3 a