Diketahui barisan bilangan 3, 8, 13, 18, 23, ... suku ke- 28 adalah ...
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Penjelasan dengan langkah-langkah:
barisan bilangan 3, 8, 13, 18, 23, ...
a = 3
b = 13 - 8
b = 5
U28 = a + (28 - 1)b
U28 = 3 + 27 x 5
U28 = 3 + 135
U28 = 138
Sn = a + ( n - 1 ) b
S28 = a + ( 28 - 1 ) ( U2 - U1 )
S28 = 3 + 27 ( 8 - 3 )
S28 = 3 + 27 ( 5 )
S28 = 3 + 135
S28 = 138
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