The 2-to-1 MUX in one table
A quick reminder from Module 2. The 2-to-1 MUX routes one of two inputs to the output: s = 0 picks a, s = 1 picks b.
| s | y |
|---|---|
| 0 | a |
| 1 | b |
That table is a two-term sum of products: one product passes a while s is 0, the other passes b while s is 1.