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Answer:
3
Explanation:
do I really need to explain?
2 cookies + 1 cookie = 3 cookies
2 represents unit 1 2 and 1 represents unit 1. 2 is worth twice of one and is regarded as 2 1s. so 2 + 1 = 1 + 1 + 1. Then 3 represents 3 ones. so 1 + 1 + 1 = 3 1s.
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