1 A0 | 20 power |
2 A1 | 19 P0 |
3 A2 | 18 P1 |
4 A3 | 17 P2 |
5 B0 | 16 P3 |
6 B1 | 15 P4 |
7 B2 | 14 P5 |
8 B3 | 13 P6 |
9 | 12 P7 |
10 ground | 11 |
3b.
One good answer is:
You can't really combine multiple copies of the above chip to make larger
multiplications, at least not in an easy way.
In the case of multi-bit adders,
any number of 4-bit full-adder chips can be combined to make a 4n-bit
full-adder, by just connecting the carry-out from one to the carry-in into
the next.
Multiplication doesn't work this way.
(There are other possible answers too.)