Question

Câte numere naturale neamule mai mici sau egale cu 48 sunt divizibile cu 2 sau cu 3?

Answer 1

Divizibile cu 2:
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48.

Divizibile cu 3:
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48.


Raspuns: Sunt 33 de numere naturale neamule mai mici sau egale cu 48 care sunt divizibile cu 2 sau cu 3.

Answer 2

A={2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48}

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

A U B = {2, 4, 6, 8, 10, 12, 14, 16,18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 3, 9, 15, 21, 27, 33, 39, 45}

card(AUB) = 32