1) All ostrich are birds. All birds are vertebrates. Therefore,..... a) Some birds are not vertebrates. b) Some vertebrates are not birds. c) No vertebrate is a bird. d) All vertebrates are birds. 2) All Nuevo Leoneses are Mexicans. Some teachers are Nuevo Leoneses. Therefore,... a) All Mexicans are teachers. b) Some teachers are not from Nuevo Leon. c) No teacher is from Nuevo Leon. d) All the teachers are Mexican. 3) All Mexicans are Americans. Some scientists are Mexicans. Therefore,..... a) Some Americans are not scientists. b) All Americans are scientists. c) Some Americans are not scientists. d) All scientists are Mexican. 4) All Saxons have white skin. Some singers are Saxons. Therefore, .... a) Some singers do not have white skin. b) All Saxons are singers. c) No singer is Saxon. d) Some Saxons do not have white skin. 5) Which of the following statements is a conjunction? a) "Today is Friday, so I'm going to dance" b) "Today is a holiday and it woke up raining" c) "Today is a holiday or it woke up raining" d) "My name is Rosmary, I am a teacher" 6) Which of the following statements is a disjunction? a) "If it doesn't rain, we'll go to the park" b) "Your name is Carmen or Maria" c) " Your name is Carmen and Maria" d) " it is rain and we are going to the park" 7) Which of the following statements is a conditional? a) "I have a TV and phone" b) "I can win the lottery if and only if I buy a ticket" c) "If I win the lottery, I'm going on a trip" d) "I can buy a TV or a cell phone" 8) Which of the following statements is a biconditional? a) "If I study enough, I will pass the exam" b) "I will eat bread only if it has cheese" c) "I like bread and cheese" d) "I like bread or I like cheese" 9) in which of the following propositions "," means so or then. a) "My name is Maria, Carmen" b) "Luis studies, besides he working" c) "Today is Friday, I'm going to dance" d) "I will marry only, if it is with you" 10) when a proposition is negative, we represent it: a) p & q b) -p or q c) p <-> q d) -p

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