7. Little Lucas invented his own way to write down negative numbers before he learned the usual way with
the negative sign (–) in front. Counting backwards from +3, he would write: 3, 2, 1, 0, 00, 000, 0000, ...
What is the result of 000 + 0000 in his notation?
(A) 1 (B) 00000 (C) 000000 (D) 0000000 (E) 00000000
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