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u6= a + 6b = 243
6b-2b = 243-9
4b = 244
b = 61
a+ 2b = 9
a + 122 = 9
a = 9 - 122 = -113
Sn (jumlah) = n/2 ( 2a + (n-1) b)
S5 = 5/2 (2(-113) + (4) 61)
S5 = 5/2 (-226 + 244)
S5 = 5/2 (18)
S5 = 5 x 9 = 45