Question Number 76575 by Rio Michael last updated on 28/Dec/19
$${define}\:{the}\:{concept}\:{of}\:{a}\:\boldsymbol{{contingency}} \\ $$$${Which}\:{of}\:{the}\:{following}\:{is}\:{a}\:{contingency}\: \\ $$$${and}\:{which}\:{is}\:{a}\:{tautology} \\ $$$$\left.\mathrm{1}\right)\:\left({P}\:\Rightarrow\sim{P}\right)\:\vee\:{Q}\:\: \\ $$$$\left.\mathrm{2}\right)\:\left({P}\:\Rightarrow\:\sim{P}\right)\:\Rightarrow\:{Q} \\ $$
Answered by benjo 1/2 santuyy last updated on 28/Dec/19
Commented by Rio Michael last updated on 28/Dec/19
$$\mathrm{iguess}\:\mathrm{all}\:\mathrm{are}\:\mathrm{contingency}'\mathrm{s} \\ $$
Commented by benjo 1/2 santuyy last updated on 28/Dec/19
$${yes} \\ $$