Connecting contrapositives
Started by
Flavio
· started 2016-01-26 04:45
· last activity 2016-01-26 22:56
· 1 reply
When connecting the contrapositives to come up with the answer B, is it best to always start with the middle/ second sentence to connect all our points and come up with the conclusion?
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Mehran
· 2016-01-26 22:56
Not sure I understand. The order is irrelevant.
For the transitive property, the key is identifying variables in common.
So for example:
ER ==> DGSL
DGSL ==> BIL
Notice DGSL is the variable in common, so we can connect them as follows:
ER ==> DGSL ==> BIL
If we took the contrapositives, the variable in common is not DGSL:
not DGSL ==> not ER
not BIL ==> not DGSL
So we would connect as follows:
not BIL ==> not DGSL ==> ER
Hope this helps!
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