Discrete Structure$-2$

Chapter $-9($ Counting$)$

$9\mathrm{.}25($programming required$)$ Write a program, in a language of your choice, to enumerate all bitstrings in $\{0,1{\}}^{16}$ and count the number

that have $0,1,2,$ and $3$ ones. Use this program to verify your answer to Exercise $9\mathrm{.}24$ and your approach to Exercise $9\mathrm{.}23.$