S n = sum i=1 ^ n i = n ^ 2 - 99
ngasal = report
Nyontek Google = Pelanggaran
ngasal = report
Nyontek Google = Pelanggaran
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Diketahui :
Sn = n² - 99
Ditanya :
a10?
Jawab:
S10 = 10² - 99 = 100 - 99 = 1
S9 = 9² - 99 = 81 - 99 = -18
a10 = S10 - S9 = 1 - (-18) = 1 + 18 = 19
Answered by BBO