Using the first two houses as an example,can you work out which number is missing from the thirdhouse?3 9 64 7 8 2 3 42 4 4 3 6 8 7 5
问题描述：
Using the first two houses as an example,can you work out which number is missing from the third
house?
3 9 6
4 7 8 2 3 4
2 4 4 3 6 8 7 5
答
5,
答
9
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