I want to express this a bit more simply than other posters using powers of…
Start with one switch, this gives two options (on or off)
Add a second switch now you have four options (on/on, off/off, on/off, off/on)
If you keep adding switches, each time you double the number of options you have so the sequence goes:
2, 4, 8, 16, 32, 64, 128, 256, 512, 1024
Which is why we have 1024 megabytes, not 1000 – it’s difficult to get exactly 1000 options just using switches, it’s easy to get 1024 options.
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