Question 179325This question is from textbook
: Write the converse, inverse, and contrapositive of the following conditional statement
If a dog is barking, then it will not bite
This question is from textbook
Found 2 solutions by Fombitz, Edwin McCravy: Answer by Fombitz(32388) (Show Source):
You can put this solution on YOUR website! Here's are the general guidelines to if-then constructions,
Original Statement: if (a) then (b)
Converse Statement: if (a) then (b)
Inverse Statement: if (not a) then (not b)
Contrapositive Statement: if (not a) then (not b)
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a=dog is barking,
b=dog will not bite
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Original Statement : If a dog is barking, then it will not bite.
Converse Statement: If a dog is not biting, then it will bark.
Inverse Statement: If a dog is not barking, then it will bite.
Contrapositive Statement: If a dog is biting, then it will not bark.
Answer by Edwin McCravy(20054) (Show Source):
You can put this solution on YOUR website! Edwin's solution:
Note: Fombitz has
Original Statement: if (a) then (b)
Converse Statement: if (a) then (b)
Inverse Statement: if (not a) then (not b)
Contrapositive Statement: if (not a) then (not b)
But he should have had:
Original Statement: if (a) then (b)
Converse Statement: if (b) then (a)
Inverse Statement: if (not a) then (not b)
Contrapositive Statement: if (not b) then (not a)
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Write the converse, inverse, and contrapositive of the following conditional statement
If a dog is barking, then it will not bite.
Write that as BARKING -> ~BITE
Then use the rules:
1. To form the converse conditional of a given conditional,
exchange what's on the left of the -> with what's on the right.
(But do not NEGATE either one.)
So the converse conditional of the given conditional
BARKING -> ~BITE
is
~BITE -> BARKING, or
If a dog will not bite, then it will be barking.
Note: I changed "is barking" to "will be barking" to make
the sentence clearer without changing the meaning. You can
change the tense of the verbs without changing the meaning.
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2. To form the inverse conditional of a given conditional,
NEGATE both what's on the left of the -> as well as what's
on the right. (But do not exchange them). To NEGATE, if
there is a ~ before it, take it off, and if there is no ~
before it, put a ~ before it.
So the inverse conditional of the given conditional
BARK -> ~BITE
is
~BARK -> BITE, or
If a dog is not barking, then it will bite.
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3. To form the contrapositive conditional of a given conditional,
EXCHANGE what's on the left of the -> with what's on the right AND
NEGATE them also.
So the contrapositive conditional of the given conditional
BARK -> ~BITE
is
BITE -> ~BARK, or
If a dog will bite, then it will not be barking.
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Notice also these facts that will help you understand:
1. the original statement and the contrapositive
are equivalent statements.
2. the converse and the inverse are equivalent
statements.
3. the original and its equivalent contrapositive ARE NOT
equivalent to the equivalent inverse and converse.
4. the inverse is the contrapositive of the converse.
5. the converse is the contrapositive of the inverse.
Edwin
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