1² + 2² + 3² +. . . . . . . . . . . . . . . . . +20²
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Answer:
1² + 2² + 3² + 4²+ 5²+ 6² + 7²+ 8²+ 9² + 10² + 11² + 12² + 13² + 14² + 15² + 16² + 17² + 18² + 19² + 20²
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0
Answer:
(1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20)^2
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