Un = a + (n - 1)b
396 = 102 + (n - 1)6
396 = 102 + 6n - 6
396 + 6 - 102 = 6n
300 = 6n
n = 300 : 6
n = 50
Baru kita cari S₅₀ dengan menggunakan rumus Sn
Sn = n/2 (a + Un)
S₅₀ = 50/2 (102 + 396)
= 25 x 498
= 12.450
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Un = a + (n - 1)b
396 = 102 + (n - 1)6
396 = 102 + 6n - 6
396 + 6 - 102 = 6n
300 = 6n
n = 300 : 6
n = 50
Baru kita cari S₅₀ dengan menggunakan rumus Sn
Sn = n/2 (a + Un)
S₅₀ = 50/2 (102 + 396)
= 25 x 498
= 12.450