Valid & Invalid Argument Forms Flashcards
1
Q
A—->B
/B
_____
/A
A
Valid 2
Negate the Necessary
2
Q
A some B
A some C
________
B some C
A
Invalid 7
3
Q
A—->B
B
_____
A
A
Invalid 1
Affirm the Necessary
4
Q
A—>B—>C
________
A—->C
A
Valid 3
Transitive
5
Q
A most B—-> C
____________
A most C
A
Valid 5
6
Q
A—–>B some C
____________
A some C
A
Invalid 3
7
Q
A—->B
A
_____
B
A
Valid 1
Affirm the Sufficient
8
Q
A some B—–> C
_____________
A some C
A
Valid 4
9
Q
A—–>B
A most C
________
B some C
A
Valid 8
10
Q
A most B
A most C
_______
B some C
A
Valid 9
11
Q
A most B most C
_____________
A some C
A
Invalid 6
12
Q
A—->B
A—–>C
______
B some C
A
Valid 6
13
Q
A—->B
/A
______
/B
A
Invalid 2
Negate the Sufficient
14
Q
A—->C
B—–>C
______
/A some /B
A
Valid 6
Corollary
15
Q
A some B some C
______________
A some C
A
Invalid 5
