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Questions on Apply function


Please look at the following code. I'm wondering the output 1 doesn't
give me the right answer. 6435-4545 should be 1890. Is there anything
wrong with input 1? It seems that it is correct, because input 3 works
well.

Thanks,
Peng

In[1]:=
Apply[(#+{-6750,6435})&,{{6945,-4545},{6945, -4545}},{1}]

Out[1]=
{{195,13380},{195, 13380}}

In[2]:=
{-6750,6435}+{6945,-4545}

Out[2]=
{195,1890}

In[3]:=
Apply[(#+{a,b})&,{{a1,b1},{a2,b2},{a3,b3}},{1}]

Out[3]=
{{a+a1,a1+b},{a+a2,a2+b},{a+a3,a3+b}}


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