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Reasoning and Writing of Proofs 2
A
B
C
D
Result
. . . .

Choose the correct answer to each question.

1. Angel folds a piece of paper in the following manner:
How many triangles will she form after the fourth fold?
4
8
10
16
Answer: 16
2. How many matchsticks are needed to form the tenth figure?
10
19
20
21
Answer: 21
3. In a meeting, there are 5 teachers and 3 parents. How many possible handshakes are there if each of them shakes hands with one another?
8
28
36
72
Answer: 28
4. Which of the following is the same as a statement in if-then form?
conditional
disjunction
conjunction
biconditional
Answer: conditional
5. Which specific case shows that a conjecture is not always true?
proof
inverse
negation
counterexample
Answer: counterexample
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