Mathematics for IGCSE & O level - Sets (Section 1 - No. 29)
If P = {x | x is a multiple of 5} and Q = {10, 20, 30, 40, 50}, which of the following statements is true?
P ⊆ Q
Q ⊆ P
P = Q
P and Q are disjoint
Giải thích
Since all elements of Q are multiples of 5, and P is defined as multiples of 5, Q is a subset of P