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Antara 100 dan 300
102, ... , 294
Un = a + (n - 1)b
294 = 102 + (n - 1)6
294 - 102 = 6n - 6
192 = 6n - 6
198 = 6n
N = 33
Sn = n/2 (a + un)
S33 = 33/2 (102 + 294)
S33 = 33/2 (396)
S33 = 6534
28.
Terdapat:..5M 4H 3K
Diambil:....1M 1H 1K
A = kejadian terambilnya 1 bola merah , 1 bola hitam dan 1 bola kuning
n(A) = ₅C₁ × ₄C₁ × ₃C₁
.......= 5..× 4....× 3
.......= 60 cara
n(S) = ₁₂C₃ = 220 cara
p(A) = n(A) / n(S)
.......= 60/220
.......= 3/11