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P=n^2
P=4^2=16
15. a=2
r=3
S7=(2*3^7 -1)/1 =4372
A = {(1,4), (2,3), (3,2), (4,1)} ⇒ n(A) = 4.
pelemparan dua buah dadu ⇒ n(S) = 36
P(A) = n(A) / n(S) =
nomor 15.
2, 6, 18,... ⇒ a = U₁ = 2 dan r = U₂/U₁ = 6/2 = 3
Sn = : 2 = 1093