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jd jwbnnya 1234
maaf kalau tidak membantu
1² 2² 3² .............................= 1
2² 3² 4² .............................= 12
3² 4² 5² ............................= 123
4² 5² 6²..............................= 1234 ← ini S-nya
5².......................................= 12345
maka S = 1234