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di uang logam terdapat angka (a) dan gambar (g)
1. ruang sample diagram pohon
a> a > a = aaa
> g = aag <- 1
>g > a = aga <- 2
>g = agg
g > a >a = gaa <- 3
>g = gag
>g >a = gga
>g = ggg
banyaknya ruang sample adalah 8
3. peluang munculnya 2a dan 1g)
adalah 3 peluang