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Dimulai dari 207, .... sampai 396
Un = a + (n - 1) b
396 = 207 + (n - 1) 9
396 = 207 + 9n - 9
396 = 198 + 9n
396 - 198 = 9n
198 = 9n
N =
N = 22
Sn = + (2 x a + (n - 1) 9 )
Sn = 11 x (2 x 207 + (22 - 1) 9)
Sn = 11 x (414 + 198 - 9)
Sn = 11 x ( 414 + 189)
Sn = 11 x 603
Sn = 6.633
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