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selisih = 3,5,7,9...
1 ---> 0 = 1² - 1
2 ---> 3 = 2² - 1
3 ---> 8 = 3² - 1
4 ---> 15 = 4² - 1
5 ---> 24 = 5² - 1
n = n² - 1
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