Receiving a Variable Number of Arguments

Answers (10 and 172630728) are incorrect; they should be 42 and 473.

Count integers (6 and 9) are missing after start of brackets of 'cout' lines.

i.e.
 cout<< sum(6, 2,4,6,8,10,12) <<endl;
 cout<< sum(9, 11,22,33,44,55,66,77,66,99) <<endl;

(Also note, second list has 66 twice and not 88 as one might assume.)

The reason for the answers in the book:
sum(2,4,6,8,10,12) - adds 4 and 6 to get 10 the other numbers are thrown out.
sum(11,22,33,44,55,66,77,66,99) - adds the 8 values supplied plus the next 3 values in memory.

::TIM::