Question

If $T=\left\{\text{x : x is a letter in the word 'TEETH'}\right\}$, find all its subsets.

Answer 1

Set $T=$ { $T,E,H$ }
We can form subsets of a set by taking no element or one or more elements from it.
So, the subsets of set $T$ are $\varphi ,\left\{t\right\},\left\{e\right\},\left\{h\right\},\{t,e\},\{t,h\},\{e,h\},\{t,e,h\}$.