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Mathematics 19 Online
OpenStudy (devonhoward15):

Which argument is valid?

OpenStudy (devonhoward15):

OpenStudy (devonhoward15):

@Mehek14

OpenStudy (devonhoward15):

@Vocaloid

OpenStudy (devonhoward15):

@agent0smith

Vocaloid (vocaloid):

any ideas? remember, you can only use the information inside the problem.

OpenStudy (will.h):

i guess that is about indirect prove? am i right

Vocaloid (vocaloid):

nope

OpenStudy (devonhoward15):

i got the 3rd one

Vocaloid (vocaloid):

remember you're looking for if A then B if B then C if A then C format

Vocaloid (vocaloid):

the dog one is not correct because it doesn't tell us whether a dog is an animal or not

OpenStudy (devonhoward15):

im debating between the 3rd and 4th

OpenStudy (will.h):

yes so i assume you are right picking C because the others make no sense and can be prove by using the False Assumption

Vocaloid (vocaloid):

it's either the third or fourth

Vocaloid (vocaloid):

we just proved that the third is incorrect

OpenStudy (devonhoward15):

second one is wrong because a rectangle can not be a square

Vocaloid (vocaloid):

so it must be the fourth one

Vocaloid (vocaloid):

actually, rectangles can be squares, but not by the reasoning in the problem

OpenStudy (devonhoward15):

and 1st is wrong because not just fish have fins and can swim

Vocaloid (vocaloid):

remember: you can only use the information inside the problem. you are not allowed to bring in outside knowledge

OpenStudy (devonhoward15):

i tought rectangles cant be squares but a square can be a rectangle

Vocaloid (vocaloid):

all squares are rectangles

OpenStudy (devonhoward15):

its the 4th one

Vocaloid (vocaloid):

therefore, a rectangle with 4 equal sides is a square

Vocaloid (vocaloid):

yes, the fourth one is correct

OpenStudy (will.h):

i believe it can be the fourth because in the 2nd statement if a number is divisible by 6 then it is divisible by 2 and that is correct and the 3rd statement is also correct so yeah that is indirect proof and that is correct

OpenStudy (devonhoward15):

thanks

OpenStudy (agent0smith):

All you needed to do was pay close attention to what vocaloid said.. it doesn't look at all like you were. if A then B if B then C if A then C The statement could say: If all mice are elephants If all elephants are platypuses If it is a mouse, then it is a platypus It's that easy.

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