Дан фрагмент таблицы истинности для выражения F:
|
x1 |
x2 |
x3 |
x4 |
x5 |
x6 |
x7 |
F |
|
|
|
|
1 |
|
0 |
|
0 |
|
|
|
|
0 |
|
|
1 |
1 |
|
0 |
|
|
1 |
|
|
|
0 |
Каким выражением может быть F?
1)
x1 and !x2 and !x3 and !x4 and x5 and x6 and x7
2)
!x1 or x2 or x3 or !x4 or !x5 or !x6 or !x7
3)
x1 and x2 and !x3 and x4 and x5 and !x6 and x7
4)
x1 or !x2 or !x3 or !x4 or !x5 or !x6 or !x7