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Logic
Pages 71–72
Check for Understanding
1.
The conjunction (
p
and
q
) is represented by the
intersection of the two circles.
2a.
Sample answer: October has 31 days or
2
5
1
3
52
8.
2b.
Sample answer: A square has five right angles
and the Postal Service does not deliver mail on
Sundays.
2c.
Sample answer: July 5th is not a national
holiday.
3.
A conjunction is a compound statement using the
word
and
,while a disjunction is a compound
statement using the word
or
.
4.
9
1
5
5
14 and February has 30 days.; false,
because
p
is true and
q
is false
5.
9
1
5
5
14 and a square has four sides.; true,
because
p
is true and
r
is true
6.
February has 30 days and a square has four
sides.; false, because
q
is false and
r
is true
7.
9
1
5
5
14 or February does not have 30 days.;
true, because
p
is true and
,
q
is true
8.
February has 30 days or a square has four sides.;
true, because
r
is true
9.
9
1
5
Þ
14 or a square does not have four sides.;
false, because
,
p
is false and
,
r
is false
10.
11.
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 Fall '10
 Dr.Zhan
 Calculus, Logic, PreCalculus, Angles

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