Consider the statements a, b, c and d given below. Which one of the codes contains the correct statements only?
1) Venn diagram is a clear method of notation.
2) To diagram a standard form of a categorical proposition, three overlapping circles are drawn.
3) To test a categorical syllogism, two overlapping circles are drawn.
4) Venn diagram is a method of testing the validity of categorical syllogisms.
1
1 and 2 only
2
1, 2 and 4 only
3
1, 2, 3 and 4
4
1 and 4 only