need help with a logic exercise - please Watch

1. I'm a little stumped here. give us a hand?

iv. The following arguments are all invalid. Prove this by finding, in each case, an argument with the same logical form whose premises are known to be true and whose conclusion is known to be false (the ‘counterexample technique’). (8 marks)

a. Most logicians are philosophers; few philosophers are unwise; so at least some logicians are wise.

b. Few Sicilians approve of abortion; many atheists approve of abortion; so few atheists are Sicilian.

c. Some nerds are trainspotters; some nerds wear parkas; so some trainspotters wear parkas.

d. Many ordinary people are corrupt; all politicians are ordinary people; so some politicians are corrupt.

need to hand this in by 5pm so all help much appreciated. thanks.
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2. c: Most Bananas are fruit, most fruit are round, so at least some bananas are round.

both premises are true, as most bananas are indeed fruit (they all are) and most fruit are round (but not all). The conclusion is false, as there are no round bananas. Thus, the argument is invalid.

C: was the easyest to do, as the others require a bit more explanation, but i hope you get the gist. Find examples to replace the existing premises that are true, but make sure that they create a false conclusion to show that the argument is invalid.
3. Someone goes to Lancaster and is doing first year Philosophy...

EDIT: And for future reference, you need to hand your work in by 4pm, not 5pm.

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