1² + 2²+ 2² = 3²
2²+3² +6²0 = 7²
3²+ 4²+ 12² = 13²
4²+_?_+20²=21²
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Answer:
3² + 4²
Step-by-step explanation:
1²+2²+2²=3²=9
2²+3²+6²=7²=49
3²+4²+12²13²=169
And, 4²+3²+4²+20²=21²
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