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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
Sn = 1/2 . n (11 - n)
Un = Sn - S(n - 1)
U10 = S10 - S9
U10 = (1/2 . 10 . (11 - 10)) - (1/2 . 9 . (11 - 9))
U10 = (5 . 1) - (1/2 . 9 . 2)
U10 = 5 - 9
U10 = -4