2000 AD Regened: A thrill-powered comics collection for Earthlets of all ages! (1)

2000 AD Regened: A thrill-powered comics collection for Earthlets of all ages! (1)

Matematika Carilah jumlah 7 suku pertama pada deret geometri 4 + 12 + 36 + 108 + ...​

Carilah jumlah 7 suku pertama pada deret geometri 4 + 12 + 36 + 108 + ...​

Penjelasan dengan langkah-langkah:

a = 4

r = U2/U1

r = 12/4 = 3

Sn = a(rⁿ - 1)/(r - 1)

S7 = 4(3⁷ - 1)/(3 - 1)

S7 = 4(3⁷ - 1)/2

S7 = 2(3⁷ - 1)

S7 = 2(2.187 - 1)

S7 = 2(2.186)

S7 = 4.372

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