Question: Bad result of summation

 

L(1):=[1,2,3]:

L(2):=[A,B,C]:

sum(nops(L(i)),i=1..2):

 

The real result of the sum is : 6.

Maple's result is : 2.

Yes, Maple gives an error.
But it doesn't matter, Maple is the most extraordinary software of the world !!!

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