ทฤษฎีจำนวน 2 ข้อครับ
1. $a,b,c\in \mathbb{N} , a|(2b+1),b|(2c+1),c|(2a+1) \Rightarrow \max(a+b+c)=?$
2. What is the minimum size of a collection of perfect squares, with repetitions allowed, such that every positive integer up to 100 can be expressed as a sum of the numbers in the collection? A sum may consist of one number from the collection as well.
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