Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2021 — Part 02 Question 87

Math Olympiad Vault · MathNet 2021 — Part 02

Question 87

Suppose set $S = \{1, 2, 3, \dots, 10\}$ and the subset $A$ of $S$ satisfies

$$
A \cap \{1, 2, 3\} \neq \emptyset, \quad A \cup \{4, 5, 6\} \neq S.
$$
The number of such subsets is ________.