Question

Write down all the subsets of the following sets:
(i) {a}
(ii){a, b}
(iii) {1, 2, 3}
(iv) $\phi$

Answer 1

(i) The subsets of {a} are $\phi$ and {a}.

---

(ii) The subsets of {a, b} are $\phi$, {a}, {b}, and {a, b}.

---

(iii) The subsets of {1, 2, 3} are $\phi$, {1}, {2}, {3}, {1, 2}, {2, 3}, {1, 3}, and {1, 2, 3}

---

(iv) The only subset of $\phi$ is $\phi$.