Q1.10

The numbers $1, 2, 4, 8, \dots 2^n, \dots$ written in binary

The numbers $1, 2, 4, 8,\dots 2^n, \dots$ written in unary

The set of binary string in which the number of zeros is the same as the number of ones.

The set $\{1, 101, 11011, 1110111, \dots\}$