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= 10! / (10-3)!.3!
= 10.9.8.7! / 7!.3.2.1
= 120
n(m) = 6
n(p) = 4
a. n(E) putih = 4C3
= 4! / (4-3)!.3!
=4! / 1!.3!
= 4.3! / 3!
= 4
P = n(E) putih / n(S)
= 4/120
=1/30
b. n(E) merah = 6C2
= 6! / (6-2)!.2!
= 6!/4!.2!
= 6.5.4! / 4!.2!
= 15
n(E) putih = 4C1
= 4! / (4-1)!.1!
= 4.3!/3!.1!
= 4
P = 15/120 + 4/120
= 19/120