1. Rumus : Un = a + (n - 1)b
Sn = n/2 (2a + (n - 1)b)
Diketahui : a = 10, b = 3
a) U15 = a + 14b = 10 + (14 x 3) = 52
U25 = a + 24b = 10 + (24 x 3) = 82
b) S25 = 25/2 (2a + 24b) = 25/2 ((2 x 10) + (24 x 3)) = 1.150
2. Rumus : Un = a . r^(n - 1)
Diketahui : a = 2
a) r = 4 : 2 = 2
b) U8 = a . r⁷ = 2 . 2⁷ = 256
U10 = a . r⁹ = 2 . 2⁹ = 1024
c) 2, 4, 8, 16, 32, 64, 128, 256
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1. Rumus : Un = a + (n - 1)b
Sn = n/2 (2a + (n - 1)b)
Diketahui : a = 10, b = 3
a) U15 = a + 14b = 10 + (14 x 3) = 52
U25 = a + 24b = 10 + (24 x 3) = 82
b) S25 = 25/2 (2a + 24b) = 25/2 ((2 x 10) + (24 x 3)) = 1.150
2. Rumus : Un = a . r^(n - 1)
Diketahui : a = 2
a) r = 4 : 2 = 2
b) U8 = a . r⁷ = 2 . 2⁷ = 256
U10 = a . r⁹ = 2 . 2⁹ = 1024
c) 2, 4, 8, 16, 32, 64, 128, 256