3-input OR, A = 0, B = 0, C = 1 — OR gate
coreone high input dominates
Answer
output 1
Why this example is worth doing
One high input out of three is enough. OR's absorbing value is 1, exactly mirroring AND's absorbing 0, and the page presents the pair as duals rather than as two facts. The practical form is the interrupt line: a wide OR over many request signals asserts when any single device wants attention, which is why OR trees sit at the top of interrupt controllers and why the output tells you something happened but not what.
Try your own input in the OR gate. Truth table, symbol and algebraic form for A + B, with a live two-input toggle.
How the answer is reached
The probed row
A = 0, B = 0, C = 11— Row 1 of 8.
Truth table
| # | A | B | C | A + B + C |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 |
| 1 | 0 | 0 | 1 | 1 |
| 2 | 0 | 1 | 0 | 1 |
| 3 | 0 | 1 | 1 | 1 |
| 4 | 1 | 0 | 0 | 1 |
| 5 | 1 | 0 | 1 | 1 |
| 6 | 1 | 1 | 0 | 1 |
| 7 | 1 | 1 | 1 | 1 |