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n(f : A → B) (1-1) = n!
n --> banyak anggota
1. n(A) = 4
n(B) = 4
Korespondensi = 4!
= 4 x 3 x 2 x 1
= 24
2. n(R) = 5
n(S) = 5
Korespondensi = 5!
= 5 x 4 x 3 x 2 x 1
= 120