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10. The two wffs in ? {P, P Q } imply Q. This is called a. modus operandi b. modus ponens c. modem digitalis d. muy de modo 11. Resolution as an inference rule is sound but not a. incomplete b. complete c. refutable d. irrefutable wff ? ( ??-0) if and only if is true 12. A set of wff's Ais said to whenever all wffs in Aare true a. predict b. predispose c. presuppose d. entail 13. Two wffs are said to be if their truth values are identical under all interpretations a ancestors b. successors c. equivalent d. connected