On Jul 13, 2:22 am, Eukie_M_SHIRAISHI <ms.eu...@gmail.com> wrote:
> Select the truths from the following 1) -- 5)
>
> 1) If [ if P, then Q ], then there can be the case in which [ if not-P,
> then not-Q ].
>
> 2) If [ if P, then Q or R ], then either [ if P, then Q ] or [ if P,
> then R ].
>
> 3) If and only if [P and not-Q] is a contradiction, [ if P, then Q ]
> holds true.
>
> 4) If and only if there is a case in which Q does not hold true despite
> P holds true, [ if P, then Q ] does not hold true.
>
> 5) If there is a case in which P does not hold true, then P is a
> contradiction.


This is easy, just take two Qs, without the mayo, co-mingle with a
single P at a time for about 5 cycles, take two drams of quinine and
add to the mix, and then let sit in the sun for about an hour. If the
sun is bright enough you will soon find that the Qs now hold true and
the Ps cancel one another out. It may take a few times to get it
right.

Marc