diketahui : A= himpunan kelipatan 3 kurang dari 50 B= himpunan kelipatan 6 kurang dari 50 C= himpunan kelipatan 9kurang dari 50 tentukanlah A.anb; B. anc; C. bn

A = {3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48}

B = { 6, 12, 18, 24, 30, 36, 42, 48}

C = { 9, 18, 27, 36, 45}

Jawaban :
A ∩  B = { 6, 12, 18, 24, 30, 36, 42, 48}

A ∩ C = { 9, 18, 27, 36, 45}

B ∩ C = { 18, 36 }