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Mathematics 9 Online
OpenStudy (anonymous):

can you be nice and please help me with my geomety question?

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

wich step in alex prove is incorrect

OpenStudy (anonymous):

are u muslim

OpenStudy (anonymous):

prove: 13 is a factor of 195 step 1; assumm that 13 is not a factor of 195 step 2;195 divided by 13 is 15 step 3 a factor is an integer by wich another integer is a multiple

OpenStudy (anonymous):

step; therefore 13 is must be a factor of 195

OpenStudy (ikram002p):

lol @subway_surfers weird qs he asked for help n u aske if he is muslim :o

OpenStudy (anonymous):

wich step in alex prove is incorrect?

OpenStudy (anonymous):

i am not a he i am a she

OpenStudy (anonymous):

i was waiting on her question

OpenStudy (ikram002p):

ohk sry :)

OpenStudy (anonymous):

i am not muslim i am from Puerto rico is just that i wrote my name back words

OpenStudy (anonymous):

My name is Daisy can you help me with my question

OpenStudy (anonymous):

pleaseee?

OpenStudy (anonymous):

how do u mention someone

OpenStudy (anonymous):

what?

OpenStudy (ikram002p):

ok the proof it seems week all of it but tell me ur coures name n ill help u wid it

OpenStudy (anonymous):

geometry

OpenStudy (anonymous):

can you help?

OpenStudy (ikram002p):

in geometry , to prove 13 is a factor of 195 means u can construct a rectangle wid sides 13×M such that 195 =13 M in our case M=15 ok ?? |dw:1389892480316:dw|

OpenStudy (ikram002p):

nw lets prove it by contradiction

OpenStudy (anonymous):

so i thik is step 2 that is worng

OpenStudy (ikram002p):

correct :) cuz we assumed that 13 dnt devide 195 but it minstioned that we devided by 13 :)

OpenStudy (anonymous):

but 195 divided by 13 is 15

ganeshie8 (ganeshie8):

maybe il work it this time for u, so u get a feel of how to do other indirect proofs like this :- To prove : 13 is a factor of 195 using indirect proof ##Step 1 : Assume the opposite of what u wanto prove Since we want to prove that 13 is a factor of 195, lets start by assuming the opposite is true - "13 is NOT a factor of 195". So that gives the premise that 195 is not a multiple of 13 ##Step 2 : Look for contradiction However 195/13 = 15. that means 13 goes evenly in 195. that means 195 is a multiple of 13 which is a contradiction to our premise. ##Step 3 : Conclude We arrived at contradiction cuz our assumption is wrong. So the opposite of our assumption must be true : "13 is a factor of 195"

OpenStudy (anonymous):

thank you so the answer is step 2?

ganeshie8 (ganeshie8):

prove: 13 is a factor of 195 step 1; assumm that 13 is not a factor of 195 step 2;195 divided by 13 is 15 step 3 a factor is an integer by wich another integer is a multiple

ganeshie8 (ganeshie8):

as ikram said, the proof is weak. having said that, step1 and step2 are fine. cuz in step 1 she assumed the opposite of what she needs to prove - which is correct in step2 she arrived at a contradiction which is also bit okay.

ganeshie8 (ganeshie8):

however, in step3 she needs to conclude the proof which she dint do, so for answer, il tick step3...

ganeshie8 (ganeshie8):

basic structure of any indirect proof :- step1 : assume opposite of wat u wanto prove step2 : look for contradiciton step3 : conclude

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