Banyak pemetaan A ke B adalah 81

Penjelasan dengan langkah-langkah :

A = {Bilangan kuadrat < 20} → 1² = 1

                                                   2² = 4

                                                   3² = 9

                                                   4² = 16

A = {1, 2, 9, 16}

n(A) = 4

B = {faktor dari 4} → 4 ÷ 4 = 1

                                  4 ÷ 2 = 2

                                  4 ÷ 1 = 4

B = {1, 2, 4}

n(B) = 3

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Banyak pemetaan A ke B

n(B)ⁿ⁽ᴬ⁾

= 3⁴

= 3 × 3 × 3 × 3

= 9 × 3 × 3

= 27 × 3

= 81