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b 1 pemetaan
c 2 pemetaan
B = {1, 2, 3} ---> n(B) = 3
banyak pemetaan dari A ke B = n(B)^(n(A)) = 3^4 = 81
b) A = {a , i , u , e , o} ---> n(A) = 5
B = {1, 2} ---> n(B) = 2
banyak pemetaan dari A ke B = n(B)^(n(A)) = 2^5 = 32
c) A = {1, 2, 3} ---> n(A) = 3
B = {a , b , c , d} ---> n(B) = 4
banyak pemetaan dari A ke B = n(B)^(n(A)) = 4^3 = 64