tiga uang logam dilemparkan bersamaan sebanyak 672 kali. frekuensi harapan munculnya 2 angka dan 1 gambar

3 uang koin
A = angka
G = gambar

(A + G)³ = A³ + 3A²G + 3AG² + G³
n(AAA) = 1
n(AAG) = 3
n(AGG) = 3
n(GGG) = 1
n(S) = 1 + 3 + 3 + 1 = 8

n(2 angka 1 gambar) = n(AAG) = 3

P(AAG) = n(AAG)/n(S) = 3/8

Frekuensi harapan muncul AAG
= 3/8 × 672
= 252 kali